Ribonucleic Acid and Acid‐Soluble Nucleotides of the Early Chick Blastoderm

Previousanalyses of the nucleic acid content of the embryo area in early chick blastoderms have been extended to comprise also the area opaca. The RNA‐variations in the latter are reminiscent of those in the embryo area, but from the 10‐hour‐stage on their RNA/DNA‐ratios are characteristically different. The RNA of the early blastoderm has been analyzed for its nucleotide‐composition and also a limited analysis of the acid‐soluble nucleotides has been undertaken. The last‐mentioned fraction is especially distinguished by a high proportion of uracilnucleotides. To the account is added an analysis of the content of nucleic acids and acid‐soluble nucleotides in the unincubated hen's egg.