Penta-EF-hand proteins

A calpain (; , ) is a protein belonging to the family of calcium-dependent, non-lysosomal cysteine proteases (proteolytic enzymes) expressed ubiquitously in mammals and many other organisms. Calpains constitute the C2 family of protease clan CA in the MEROPS database. The calpain proteolytic system includes the calpain proteases, the small regulatory subunit CAPNS1, also known as CAPN4, and the endogenous calpain-specific inhibitor, calpastatin.

Grancalcin is a protein that in humans is encoded by the GCA gene.

protein-coding gene in the species Homo sapiens

Peflin is a protein that in humans is encoded by the PEF1 gene.