Human CXCL12 beta (stromal cell-derived factor 1 beta, SDF-1 beta) is a 72 residue CXCL12 isoform. Seven CXCL12 isoforms (alpha, beta, gamma, delta, etc.) arise due to alternative pre-mRNA splicing and vary mainly in tissue expression and the length and composition of a C-terminal sequence extension.
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