ABSTRACT
Segmented somite tissue of 40 to 45-hour chick embryos (stage 11, Hamburger & Hamilton, 1951) shows a higher calcium-activated ATP-ase activity than the somite tissue that has not yet segmented at this stage. The enzyme activity is not extracted by prior treatment of the tissues with 50 per cent, glycerol, and is not localized in the mitochondrial fraction.
There is no difference in magnesium-activated (mitochondrial) ATP-ase activity between segmented and non-segmented mesoderm at this stage.
It is postulated that the apparent increase in calcium-activated ATP-ase at the time of segmentation may represent a synthesis of myosin or of some myosin precursor.
Copyright © 1960 by Company of Biologists
1960
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