Y-27632 is a selective and potent inhibitor of ROCK (Rho-associated coiled-coil forming kinase/Rho binding kinase).Y-27632 has a variety of activities including vascular smooth muscle contraction through the ROCK signaling (Ki = 140 nmol/L p160ROCK). This product has been reported to suppress death of human ES/iPS cells during cell dispersion and to improve cell viability after cryopreservation.