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Uptake and distribution of exogenous serum proteins in the cultured rat embryo.

Head fold stage rat embryos were cultured on a medium consisting of adult rat serum for 48 hr. During the final 10 or 20 hr of culture [35S]-methionine was added to the medium. Sera from visceral yolk sac blood vessels, exocoelomic cavity fluid, and amniotic sac fluid were analyzed by SDS-polyacrylamide gel electrophoresis followed by Amido Black staining and fluorography. Amido Black staining showed bands in all three embryonic fluid compartments which migrated at rates comparable to transferrin, alpha-fetoprotein, albumin, IgG, and hemoglobin. Fluorography, however, showed that radioactivity was restricted to alpha-fetoprotein, IgG, and hemoglobin. This suggested that at least some transferrin and albumin were transferred intact from the exogenous medium to the embryonic fluid compartments.[1]

References

  1. Uptake and distribution of exogenous serum proteins in the cultured rat embryo. Rhinehardt, A.E., Carey, S.W., Young, M.F., Klein, N.W. J. Exp. Zool. (1984) [Pubmed]
 
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