fetal tissue implant


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fetal tissue implant

or

fetal cell therapy,

implantation of tissue from a fetusfetus,
term used to describe the unborn offspring in the uterus of vertebrate animals after the embryonic stage (see embryo). In humans, the fetal stage begins seven to eight weeks after fertilization of the egg, when the embryo assumes the basic shape of the newborn and all the
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 into a patient. In experimental procedures, fetal brain tissue has been implanted in the brains of patients with Parkinson's diseaseParkinson's disease
or Parkinsonism,
degenerative brain disorder first described by the English surgeon James Parkinson in 1817. When there is no known cause, the disease usually appears after age 40 and is referred to as Parkinson's disease; a number of genes have
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 so that the fetal tissue will supply chemicals lacking in the diseased brain, but such therapy failed to show significant benefits in a controlled study. Because fetal cell therapy uses tissue from freshly aborted fetuses, the procedure is controversial. Both the ReaganReagan, Ronald Wilson
, 1911–2004, 40th president of the United States (1981–89), b. Tampico, Ill. In 1932, after graduation from Eureka College, he became a radio announcer and sportscaster.
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 and G. H. W. BushBush, George Herbert Walker,
1924–, 41st President of the United States (1989–93), b. Milton, Mass., B.A., Yale Univ., 1948. Career in Business and Government
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 administrations banned the use of federal funds for fetal-tissue research that used tissue from aborted fetuses. President ClintonClinton.
1 Town (1990 pop. 12,767), Middlesex co., S Conn., on Long Island Sound; settled 1663, set off from Killingworth and inc. 1838. The school that later became Yale opened here in 1702. Clinton is today an affluent suburb with shopping malls and vineyards.
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 lifted the ban early in his administration. The successful transplantation of eggs from fetal ovaries in experiments with mice led to the suggestion in 1994 that human fetal ovaries or eggs taken from such ovaries could be implanted in infertile women, a possibility that troubled many ethicists and others. Some fear the use of what they call "fetal farming," the conception in vitro or in vivo of embryos solely for their medical usefulness. Others point to the potential benefits in the treatment of Alzheimer'sAlzheimer's disease
, degenerative disease of nerve cells in the cerebral cortex that leads to atrophy of the brain and senile dementia and, ultimately, death. The disease is characterized by abnormal accumulation of plaques and by neurofibrillary tangles (malformed nerve
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 and Huntington's diseasesHuntington's disease,
hereditary, acute disturbance of the central nervous system usually beginning in middle age and characterized by involuntary muscular movements and progressive intellectual deterioration; formerly called Huntington's chorea.
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, and possibly in cases of nerve injury.
References in periodicals archive ?
Going in, each patient knew he or she had only a 50-50 chance of actually receiving a fetal tissue implant.
First, much of the hype that surrounded the debate about the clinical value of fetal tissue implants was exactly that--hype.
The crucial finding of the study--that fetal tissue implants made many subjects sicker--is an outcome they may not have really seen as a danger, given the rationale for the sham surgery arm.