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The ontogeny of alpha-fetoprotein (AFP) has been studied in the chicken (from 7 days of incubation until 2 days after hatching) using (1) the two-dimensional immunoelectrophoresis technique, (2) the polyacrylamide gel electrophoresis, and (3) the high resolution two-dimensional polyacrylamide gel electrophoresis. The molecular weight of AFP was estimated at 71,000. AFP was seen as a heterogeneous population composed of four isoforms which slightly differ by their isoelectric points. Up to the 18th day of development, qualitative changes in AFP heterogeneity do not occur. Only traces of the two alkaline isoforms were observed in plasma of 2 days post-hatching chickens. AFP has been identified in allantoic and cerebrospinal fluids but is not present in amniotic fluid. At 7 days of embryonic age, all the plasma AFP species are present in cerebrospinal fluid.
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