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CPF-St4 was found in the African clawed frog Silurana tropicalis. It is active against E. coli (MIC 2-4 uM), P. aeruginosa (MIC 4-8 uM), S. aureus (MIC 1 uM), M. luteus (MIC 0.5 uM), and S. cerevisiae (MIC 16 uM). CPF-St4 is also toxic to erythrocytes (HC50 64 uM) and T-lymphocytes (IC50 2 uM).