Protease stability of the LL-37 derived C10-KR8 detected by SDS-PAGE. (A) C10-KR8 (L-form): untreated peptide (arrow); peptide treated with 2. bovine chymotrypsin; 3. porcine pancreas trypsin; 4, S. aureus V8 protease; 5. fungal proteinase K; 6, porcine pancreas elastase for 1 day; peptide treated with 7, chymotrypsin; 8. trypsin; 9, S. aureus V8 protease; 10, porcine pancreas elastase for 3 h. (B) C10-KR8d (D-form): untreated peptide (arrow); peptide treated with 2. chymotrypsin; 3. trypsin; 4, S. aureus V8 protease; 5. proteinase K; 6, porcine pancreas elastase for 1 day; peptide treated with 7, chymotrypsin; 8. trypsin; 9, S. aureus V8 protease; and 10, porcine pancreas elastase for 3 h.