Slight inhibition was observed with the actin from rabbit skeletal muscle in 100-fold greater concentrations. Although this inhibition, which is only barely significant, may indicate cross-reactivity between myofibrillar actin and Aplysia actin, it is also consistent with the possibility that the skeletal muscle preparation used contained a small proportion of cy- toplasmic actin.
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An antiactin antibody that distinguishes between cytoplasmic and skeletal muscle actins.
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