function:Inhibitor of PPP1CA. Has over 1000-fold higher inhibitory activity when phosphorylated , creating a molecular switch for regulating the phosphorylation status of PPP1CA substrates and smooth muscle contraction. ,similarity:Belongs to the PP1 inhibitor family. ,tissue specificity:Isoform 1 is detected in aorta and testis. Isoform 2 is detected in aorta. ,
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