Peptide with potent vasoconstrictor properties (EC50=25 pM). Has moderate antimicrobial activity against Gram-positive bacterium S.aureus (MIC=55 uM) and against Gram-negative bacterium E.coli (MIC=110 uM). Not active against fungus C.albicans. Has weak hemolytic activity against horse erythrocytes. Expressed by the skin dorsal glands. Kasstasin is a derivation of Kassina, the taxon of origin, and the Ancient Greek word 'stasis' meaning 'stoppage of flow'. Belongs to the frog skin active peptide (FSAP) family. Brevinin subfamily.