Order Code RS21044
Updated July 13, 2006
CRS Report for Congress
Received through the CRS Web
Background and Legal Issues Related to
Stem Cell Research
Jon O. Shimabukuro
Legislative Attorney
American Law Division
Summary
In August 2001, President Bush announced that federal funds, with certain
restrictions, may be used to conduct research on human embryonic stem cells. Federal
research is limited to “the more than 60” existing stem cell lines that were derived (1)
with the informed consent of the donors; (2) from excess embryos created solely for
reproductive purposes; and (3) without any financial inducements to the donors. No
federal funds may be used for the derivation or use of stem cell lines derived from newly
destroyed embryos; the creation of any human embryos for research purposes; or cloning
of human embryos for any purposes. Legislation that responds to the limitations
imposed by the President’s 2001 announcement has been introduced. The Stem Cell
Research Enhancement Act of 2005 (H.R. 810/S. 471) would direct the Secretary of
Health and Human Services to conduct and support stem cell research without regard
to the date on which the stem cells were derived from a human embryo.
Human Embryonic Stem Cells. Human embryonic stem cells are “master
cells,” able to develop into almost any cell in the human body. Building on earlier stem
cell research, in 1998, researchers at the University of Wisconsin isolated cells from the
inner cell mass of the early human embryo, called the blastocyst, and developed the first
human embryonic stem cell lines.1 Research has focused on the potential that these cells
can offer to treat or mitigate diseases and conditions and to generate replacement tissues
for disfunctioning cells or organs.2 Research efforts have focused on spinal cord injury,
multiple sclerosis, Parkinson’s disease, Alzheimer’s disease, diabetes, and other diseases
or conditions. Scientists hope to use specialized cells to replace dysfunctional cells in the
1 Nat’l Inst. of Health, U.S. Dep’t of Health & Hum. Services, Stem Cells: Scientific Progress and
Future Research Directions 4 (2001), available at [http://stemcells.nih.gov/info/scireport/PDFs/
fullrptstem.pdf].
2 For additional information on stem cell research, see CRS Report RL33540, Stem Cell
Research: Federal Research Funding and Oversight, by Judith A. Johnson and Erin D. Williams.
Congressional Research Service ˜ The Library of Congress

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brain, spinal cord, pancreas, and other organs.3 The sources for stem cells include one
week old embryos (blastocysts) created via in vitro fertilization (IVF) to treat infertility;
five to nine week old embryos or fetuses obtained through elective abortion; embryos
created through IVF for research purposes; embryos created through cloning or somatic
cell nuclear transfer; and adult tissues (umbilical cord blood, bone marrow). Controversy
surrounds the derivation of stem cells from human embryos and fetuses. In order to
derive or extract the stem cells found within the embryo, the embryo is destroyed in the
removal process. The earliest embryonic stem cells are called totipotent cells, which
means they can develop into an entire organism, producing both the embryo and tissues
required to support it in the uterus. At a later stage of development, pluripotent
embryonic stem cells exist and can develop into almost any type of cell in the body.
These stem cells cannot form the supporting tissues, as seen with totipotent cells.4 Human
embryonic stem cells found in the early stage embryo are believed to have a greater ability
to become different types of body cells and have more uses than adult stem cells.
Background and Recent Presidential and Congressional Action
Executive Action. When President Bush took office in January 2001, he
announced that he would conduct a review of the stem cell research issue and ordered the
Department of Health and Human Services (HHS) to review the National Institutes of
Health’s (NIH) guidelines issued by the former administration. During the review period,
NIH suspended its review of applications from researchers seeking federal funds to
perform human embryonic stem cell research. On August 9, 2001, President Bush
announced that federal funds would be available to support limited human embryonic
stem cell research. The new policy provides that federal funds may be used for research
on “the more than 60” existing stem cell lines that have already been derived or were
already in existence as of the date of the announcement.5 In identifying the stem cell lines
as being eligible for federal funding, the President said these embryos, from which the
existing stem cell lines were created, had been destroyed previously and could not develop
as human beings.
Under the new policy, federal agencies, primarily NIH, will consider applications for
funding if certain standards or eligibility criteria are met. The White House fact sheet
setting forth the President’s policy states: federal funds will only be used for research on
existing stem cell lines that were derived (1) with the informed consent of the donors; (2)
from excess embryos created solely for reproductive purposes; and (3) without any
3 Id. at 4-6.
4 Generally, for human development, the term embryo is used for the first eight weeks after
fertilization and the term fetus for the 9th week through birth. HHS regulations define fetus as
“the product of conception from the time of implantation.” 45 C.F.R. § 46.203.
5 Fact Sheet, Office of the Press Secretary, White House, President’s Embryonic Stem Cell
Research Policy (August 9, 2001), available at [http://www.whitehouse.gov/news/releases/2001].
The number of available embryonic stem cell lines is now understood to be much lower than 60.
Although 78 cell lines are listed on the Human Embryonic Stem Cell Registry as eligible for use
in federal research, only 22 lines are identified as being available. For additional information on
the Human Embryonic Stem Cell Registry, CRS Report RL33540, Stem Cell Research: Federal
Research Funding and Oversight, by Judith A. Johnson and Erin D. Williams.

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financial inducements to the donors.6 The President directed NIH to examine the
derivation of all existing stem cell lines and create a registry of those lines. Pursuant to
this new policy, no federal funds will be used for: (1) the derivation or use of stem cell
lines derived from newly destroyed embryos; (2) the creation of any human embryos for
research purposes; or (3) cloning of human embryos for any purposes. The new policy
replaces previously issued stem cell guidelines and policies. The policy also requires the
creation of the President’s Council on Bioethics to study stem cells and embryo research
as well as other issues. NIH has listed entities that have developed stem cells lines that
meet the President’s criteria and are eligible for federal funding (the Human Embryonic
Stem Cell Registry). The President also stated that in FY2001, the government will spend
$250 million on research involving stem cells from other sources, e.g., umbilical cord,
placenta, adult and animal tissues.
Background and Congressional Activity. Prior to President Bush’s stem cell
announcement, and over the past years, federal law has prohibited HHS from funding
human embryo research. No federal funds have been used to support research on stem
cells derived from human embryos. Research in this area has been done through private
funding. Subsequent to several phases of action, in December 1994, President Clinton,
through an executive directive, prohibited federal funding on research to support the
creation of human embryos for research purposes and directed NIH not to allocate
resources for such research.7 The order banning funding for such research was followed
in 1996 by a legislative ban that was enacted in NIH’s funding measure.8 Congress has
passed a similar ban annually since that time. The original congressional ban stated that
federally appropriated funds could not be used for the creation of a human embryo or
embryos for research purposes or for research in which a human embryo or embryos are
destroyed, discarded, or knowingly subjected to risk of injury or death greater than that
allowed for research on fetuses in utero under 45 C.F.R. § 46.208(a)(2) and 42 U.S.C. §
289g(b). The ban defined “human embryo or embryos” to include any organism, not
protected as a human subject under 45 C.F.R. § 46 (Human Subject Protection
regulations) that is derived by fertilization, parthenogenesis, cloning, or any other means
from one or more human gametes (sperm or egg.) The rider language has not changed
significantly over the years. In the subsequent fiscal years after FY1996, the rider was
enacted in Title V (General Provisions) of the Labor, HHS and Education appropriations
acts. The prohibition does not ban fetal tissue research, although other restrictions apply.
Advances in medical science proceeded and in 1998 critical developments were
recognized by scientists at the University of Wisconsin. These researchers were able to
isolate human embryonic stem cells and coax them to grow into specialized cells. In light
of the presidential and legislative bans, NIH requested a legal opinion from the General
Counsel of HHS on whether federal funds could be used to support research on human
stem cells derived from embryos or fetal tissue. HHS’ General Counsel, Harriet Rabb,
concluded that then-current law prohibiting the use of HHS appropriated funds for human
embryo research would not apply to research using stem cells “because such cells are not
6 Id.
7 Statement on Federal Funding of Research on Human Embryos, 30 Weekly Comp. Pres. Doc.
2459 (Dec. 2, 1994).
8 Balanced Budget Downpayment Act, 1996, P.L. 104-99, § 128, 110 Stat. 26, 34 (1996).

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a human embryo within the statutory definition.”9 General Counsel Rabb determined that
the statutory ban on human embryo research defines embryo as an “organism” that when
implanted in the uterus is capable of becoming a human being. The opinion stated that
pluripotent stem cells are not and cannot develop into an organism, as defined in the
statute. HHS concluded that NIH could fund research that uses stem cells derived from
the embryo by private funds. But, because of the language in the rider, NIH could not
fund research that, with federal funds, derived the stem cells from embryos.
Some members of Congress strongly opposed HHS’ view and believed that the
legislative ban, that would continue through FY2001, covered and prohibited such
research. Others supported both the administration’s position and the funding of such
research. In response to those opposed to the HHS opinion, and the subsequently
published NIH guidelines, Secretary Shalala stated in a letter that the definition of embryo
used in the HHS legal opinion relied on the definition of embryo in the statute and that
the ban applied only to research in which human embryos are discarded or destroyed but
not to research preceding or following “on such projects.”10 The letter stated: “Moreover
... there is nothing in the legislative history to suggest that the provision was intended to
prohibit funding for research in which embryos - organisms - are not involved.”
After the HHS legal opinion, and despite expressions of congressional opposition,
NIH indicated that it would fund research on pluripotent stem cells derived from human
embryos and fetal tissue once guidelines were issued and an oversight committee was
established. Draft guidelines were published in the Federal Register in December 1999
and final guidelines were issued in August 2000.11 The guidelines provided that studies
utilizing pluripotent stem cells derived from human embryos may be conducted using NIH
funds only if the cells were derived, without federal funds, from human embryos that were
created for the purposes of fertility treatment and were in excess of the clinical need of
the individuals seeking such treatment. Based upon HHS’s interpretation, funds could not
be used to extract or derive the stem cells from the embryo, thereby destroying the
embryo. NIH initiated the applications process but ultimately funding was not granted to
the applications. The prior administration’s process was then overtaken by events and the
new policy was set.
Congressional interest in stem cell research has continued steadily since the
President’s announcement in 2001. During the 109th Congress, at least seven bills
involving stem cell research have been introduced.12 On December 20, 2005, the
President signed H.R. 2520, the Stem Cell Therapeutic and Research Act of 2005, a
measure that provides for the collection and maintenance of human cord blood stem cells
for the treatment of patients and for research (P.L. 109-129). Another measure, H.R. 810,
9 Letter from HHS Gen. Counsel Harriet Rabb to Harold Varmus, Director, NIH, January 15,
1999.
10 Letter from Secretary Shalala to the Honorable Jay Dickey, Feb. 23, 1999.
11 64 Fed. Reg.67576 (1999); 65 Fed. Reg. 51,976 (2000), respectively.
12 For additional discussion of stem cell research legislation in the 109th Congress, see CRS
Report RL33540, Stem Cell Research: Federal Research Funding and Oversight, by Judith A.
Johnson and Erin D. Williams.

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the Stem Cell Research Enhancement Act of 2005, was passed by the House of
Representatives on May 24, 2005 and is expected to be considered by the Senate.
H.R. 810 would amend the Public Health Service Act (PHSA) to direct the Secretary
of HHS to conduct and support research that utilizes human embryonic stem cells without
regard to the date on which the stem cells were derived from a human embryo.13 To be
eligible for use in research conducted or supported by the Secretary, the stem cells would
have to meet certain requirements. For example, only stem cells derived from human
embryos that were donated from in vitro fertilization clinics, were created for the purposes
of fertility treatment, and were in excess of the clinical need of the individuals seeking
such treatment would be eligible for use.
In addition to the House-passed bill and its Senate companion measure, two other
Senate proposals have garnered particular attention. S. 2754, the Alternative Pluripotent
Stem Cell Therapies Enhancement Act, would amend the PHSA to direct the Secretary
of HHS to conduct and support basic and applied research to develop techniques for the
isolation, derivation, production, or testing of stem cells that are not derived from a
human embryo. S. 2754 states that the research contemplated by the measure would not
affect any policy, guideline, or regulation regarding embryonic stem cell research or
human cloning by somatic cell nuclear transfer.
S. 3504, the Fetus Farming Prohibition Act of 2006, would amend the PHSA to
make it unlawful for any person or entity involved or engaged in interstate commerce to
either solicit or knowingly acquire, receive, or accept a donation of human fetal tissue
knowing that a human pregnancy was deliberately initiated to provide such tissue, or
knowingly acquire, receive, or accept tissue or cells obtained from a human embryo or
fetus that was gestated in the uterus of a nonhuman animal.
13 A companion bill, S. 471, was introduced by Sen. Arlen Specter on February 28, 2005.

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