SummaryPheasant and chick embryonic sera share common features as the embryo matures: emergence of albumin from a minor to a dominant position in the serum spectrum; the presence of an embryo-specific alpha-2 globulin-E which declines from a prominent position in the serum at midincubation to either disappear (chick) or become a minor component (pheasant) by the 21st day of incubation. The pheasant embryo serum contains a stage-specific serum protein, alpha-3 globulin-E, which in addition is species-specific, i.e., no similar staining protein is found in the chick embryo serum.
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