Abstract
1. 1. Histones from adult and embryonic chicken brain, liver, and dorsal skin with feather organ were studied at different developmental stages. Electrophoretic analysis in starch gel revealed seven major electrophoretic components similar to mammalian histones. The electrophoretic patterns were practically identical for all tissue analyzed. 2. 2. The amino acid composition of embryonic histones did not differ from that of adult tissues. In general, the histones from various tissues of chicken contained slightly less lysine and more dicarboxylic amino acids than the unfractionated calf thymus histone. As differentiation progressed an increase was seen in basic amino acids, especially in embryonic dorsal skin histones. 3. 3. The NH 2-terminal amino acids of embryonic and adult chicken histones were alanine (34.3–39.2 per cent) and proline (55.7–60.3 per cent); these two amino acids in similar quantities have been found in most mammalian histones, e.g. calf thymus. 4. 4. It is concluded that histological differentiation and organogenesis in chicken embryonic development is not accompanied by major qualitative changes in histone composition.
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