3.4.22.54 calpain inhibitor I IC50: 0.00025 mM 12965 3.4.22.54 calpain inhibitor II IC50: 0.00025 mM 16348 3.4.22.54 calpastatin - 1386 3.4.22.54 E-64 - 559 3.4.22.54 leupeptin IC50: 0.002 mM 217 3.4.22.54 leupeptin - 217 3.4.22.54 additional information no inhibition by calpastatin 2 3.4.22.54 additional information not inhibited by calpastatin 2 3.4.22.54 recombinant rat brain calpastatin IC50: 0.0036 mM 51905