Function
Probable cyclin-dependent protein kinase (CDK) inhibitor that functions as a repressor of mitosis in the endoreduplication cell cycle (PubMed:17098811, PubMed:26546445). Cooperates with SIM and SMR2 to promote endoreplication during leaf development (PubMed:26546445). Specifically regulates endoreduplication in epidermal pavement cells to produce the cell size pattern (PubMed:20485493). Is necessary for giant cell formation (PubMed:20485493). Positive regulator of effector-triggered immunity (ETI) (PubMed:25455564).