Abstract

1.1. In order to examine the existence of calpain I, a low (micromolar)-Ca2+-requiring form of calpain, in fish tissues, carp erythrocytes were chosen as the experimental material, since only calpain I is known to exist in mammalian erythrocytes.2.2. By DEAE-cellulose chromatography, calpain and calpastatin (specific inhibitor for calpain) were separated from carp erythrocyte hemolysate.3.3. Carp erythrocyte calpain is classified as calpain II, a high (millimolar)-Ca2+-requiring form of calpain, from the result of Ca2+-requirement for the activity.

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