SDF-1 is produced in two forms, SDF-1α/CXCL12a and SDF-1β/CXCL12b, by alternate splicing of the same gene.
SDF-1 proizvodi u dve forme, SDF-1α/CXCL12a i SDF-1β/CXCL12b, putem alternativnog splajsovanja gena.