Abstract:When injected into the amniotic sacs of fetal rats in late pregnancy, 3H-leucine is rapidly absorbed and incorporated into fetal proteins as determined by liquid scintillation spectrometry. Peak values in the fetal liver and pancreas occur around four hours after injection. Approximately 21% of the radioisotope is retained in the injected fetus at 24 hours. The remainder escapes into the maternal circulation and accounts for a gradual increase in levels in noninjected fetuses from the same litter and for persi… Show more
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