Abstract
Summary
1. Determinations were carried out of the effect of extracts from developing chick leg muscle on the increase in area of coverslip cultures derived from chick leg muscle cells. 2. Maximal stimulation with the lowest extract concentration was obtained with extracts from muscle of the 19 day embryo and the 10 day chick. Extracts from the 12 day embryo and the one-year chick were less effective. 3. The activity of the muscle extracts was found to be unrelated to the rate of cell proliferation in chick muscle tissue.
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