The function of PPP1R3C (protein phosphatase 1 regulatory subunit 3C, Ensembl gene identifier ENSG00000119938) is as follows. Acts as a glycogen-targeting subunit for PP1 and regulates its activity. Activates glycogen synthase, reduces glycogen phosphorylase activity and limits glycogen breakdown. Dramatically increases basal and insulin-stimulated glycogen synthesis upon overexpression in a variety of cell types. .