Amniocentesis | Johns Hopkins Medicine Health Library
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In Connecticut, two scientists working on the genetics of mental retardation, Mark Steele and Roy Breg, aspirated a few milliliters of fluid containing fetal cells from the amniotic sac of a pregnant woman. “}}
http://www.hopkinsmedicine.org/healthlibrary/test_procedures/gynecology/amniocentesis_procedure_92,p07762/