(A) Total, PP1 and PP2A activity were measured in the homogenate from the LV myocardium of wild type and Hsp20 transgenic hearts, which were normalized to total phosphatase activity in WT (n=9). Values=mean ± SEM, *:P <0.01 vs. wild type. (B) Total, PP1 and PP2A activity in adenoviral GFP and Hsp20 infected adult rat cardiomyocytes, normalized to total phosphatase activity in Ad.GFP group (n=6). Values= mean ± SEM. *: P<0.01 vs. Ad.GFP, #: P<0.05 vs. Ad.Hsp20.