May function as calcium sensor and modulator, contributing to cellular calcium signaling. May function by interacting with other proteins, such as TPR-containing proteins, and indirectly play a role in many physiological processes. May also play a role in suppressing tumor cell growth. {ECO:0000269|PubMed:1372446, ECO:0000269|PubMed:22399290}. This is the function of ENSG00000196754 (S100A2, S100 calcium binding protein A2).