Calcium-binding protein. Binds one calcium ion per monomer (PubMed:17030513). Can promote differentiation of adipocytes (in vitro) (By similarity). Overexpression in preadipocytes increases their proliferation, enhances adipogenesis and reduces insulin-stimulated glucose uptake (By similarity). {ECO:0000250|UniProtKB:Q9D708, ECO:0000269|PubMed:17030513}. This is the function of ENSG00000188643 (S100A16, S100 calcium binding protein A16).