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The calpains, calcium-activated neutral proteases, are nonlysosomal, intracellular cysteine proteases. The mammaliancalpains include ubiquitous, stomach-specific, and muscle-specific proteins. The ubiquitous enzymes consist ofheterodimers with distinct large, catalytic subunits associated with a common small, regulatory subunit. This geneencodes the large subunit of the ubiquitous enzyme, calpain 2. Multiple heterogeneous transcriptional start sites inthe 5' UTR have been reported. Two transcript variants encoding different isoforms have been found for this gene.(provided by RefSeq)
