 Koebnerisin (S100A15) maps to the S100 gene cluster within the epidermal differentiation complex (EDC, chromosome 1q21) and reveals an unusual genomic organization compared to other S100 members.The two alternative mRNA-isoforms of koebnerisin share the same coding region, but show differences in composition and length of adjacent untranslated regions (S100A15-short (S)