May catalyze the degradation of intercellular cohesive structures in the cornified layer of the skin in the continuous shedding of cells from the skin surface. Specific for amino acid residues with aromatic side chains in the P1 position. SCCE cleaves insulin B chain at '6-Leu- ; -Cys-7', '16-Tyr- ; -Leu-17', '25-Phe- ; -Tyr-26' and '26-Tyr- ; -Thr-27'. Could play a role in the activation of precursors to inflammatory cytokines.