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Topology and key domain organization of STIM1. A STIM1 monomer consists of an N-terminal luminal part, a transmembrane domain and a C-terminal cytosolic part. CC, coiled-coil; CAD, CRAC activation domain or SOAR, STIM–Orai activation region; EF hand, helix-loop structural domain; PBD, polybasic domain; SAM, sterile alpha motif; TM, transmembrane domain. Numbers correspond to the location of amino acid.
