The function of SYTL2 (synaptotagmin like 2, ENSG00000137501) is as follows. Isoform 1 acts as a RAB27A effector protein and plays a role in cytotoxic granule exocytosis in lymphocytes. It is required for cytotoxic granule docking at the immunologic synapse. Isoform 4 binds phosphatidylserine (PS) and phosphatidylinositol-4,5-bisphosphate (PIP2) and promotes the recruitment of glucagon-containing granules to the cell membrane in pancreatic alpha cells. Binding to PS is inhibited by Ca(2+) while binding to PIP2 is Ca(2+) insensitive. {ECO:0000269|PubMed:17182843, ECO:0000269|PubMed:18266782, ECO:0000269|PubMed:18812475}.