Description_x000D_ General description_x000D_ STIM1 (stromal interaction molecule 1) is a conserved single-pass transmembrane protein, which is expressed ubiquitously in a wide variety of human primary and transformed cell types. STIM1 is modified by phosphorylation and N-linked glycosylation. STIM1 localized predominantly in the membrane of the endoplasmic reticulum (ER). It contains an N-terminal EF hand motif located in the ER lumen and appears to function as a sensor of ER Ca2+ levels._x000D_ Immunogen_x000D_ synthetic peptide corresponding to amino acids 61-74 of human STIM1, conjugated to KLH via a C-terminal cysteine residue. The corresponding sequence is identical in rat and mouse._x000D_ Application_x000D_ Anti-STIM1 (N-terminal) antibody produced in rabbit has been used in:_x000D_ • western blotting_x000D_ • immunoprecipitation_x000D_ • immunofluorescence_x000D_ Physical form_x000D_ Solution in 0.01 M phosphate buffered saline, 7.4 pH, containing 15 mM sodium azide._x000D_ Disclaimer_x000D_ Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals._x000D_ Biochem/physiol Actions_x000D_ STIM1 (stromal interaction molecule 1) is required for the activation of store-operated Ca2+ influx. Overexpression of STIM1 and Orai1 markedly increases the calcium release-activated calcium (CRAC) current (I-CRAC).