Demonstrates that 'natural' actomyosin ATPase is inhibited by EGTA and EDTA.
EGTA/EDTA inhibition of muscle actomyosin ATPase may reflect calcium dependence; leaves open relevance to cardiac contractility in vivo.
m originally reported by Perry & Grey I that the Mg2+-activated ATPase* of I and actomyosin extracted directly as iplex from muscle, so-called 'natural' min, is strongly inhibited by low concentra- EGTA and EDTA, whereas the enzymic
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Perry et al. (1966) studied this question.
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