Synonyms:CRACM1, FLJ14466, ORAI1, ORAI1 L1, ORAI1 L2, Orail L2, ORAT1, Protein orai 1, TMEM142A, Transmembrane protein 142A Background:Ca(2+) release-activated Ca(2+)(CRAC) channel subunit which mediates Ca(2+) influx following depletion of intracellular Ca(2+) stores and channel activation by the Ca(2+) sensor, STIM1 . CRAC channels are the main pathway for Ca(2+) influx in T-cells and promote the immune response to pathogens by activating the transcription factor NFAT(PubMed:16582901).