Protein Accumulation in Early Chick Embryos Grown under Different Conditions of Explantation

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Abstract
Chick embryos were explanted at the 11 – 13 somite stage to an agar medium and the protein content of the embryos was measured after 8, 18, and 24 hours of explantation. An increase in the concentration of yolk-albumen in the medium as well as an increased extra-embryonic area was found to increase the protein contents of the explants. In the presence of a large extra-embryonic area and a high concentration of yolk-albumen in the medium, the protein content of the explant was found to approach, during the first 18 hours of explantation, the protein content of the embryo developing in the egg.