Abstract
Transfer RNA was isolated from calvaria prepared from chick embryos incubated for 15-17 days. The chargeability of the unfractionated tRNA with ten amino acids tested was very similar to that of unfractionated tRNA from adult chicken liver when data were expressed on the basis of pmoles of amino acceptance per A260 unit of tRNA. However, the relative amount of tRNA in calvaria is only about one-fourth the amount in liver. Analysis of individual species of tRNA by two-dimensional electrophoresis on polyacrylamide gels shows that there are fewer isoaccepting species of tRNA in calvaria than in liver.
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