Peptide with unknown function (PubMed:27792198). Does not show antimicrobial activity against S.aureus (MIC>512 ug/mL), E.coli (MIC>512 ug/mL) and C.albicans (MIC>512 ug/mL) (PubMed:27792198). Does not show hemolytic activity (PubMed:27792198). Antimicrobial peptide with activity against E.coli (MIC=128 ug/mL or 54 uM) and C.albicans (MIC=256 ug/mL or 108 uM) (PubMed:27792198). Does not show activity against S.aureus (MIC>512 ug/mL) (PubMed:27792198). Does not show hemolytic activity (PubMed:27792198). Forms typical alpha-helical structure in membrane. Forms typical alpha-helical structure in membrane. Expressed by the skin glands. Frenatin 4.1a is a mutant of frenatin 4.1, it has the same peptide length and is non-amidated. Frenatin 4.2a is a mutant of frenatin 4.2, it has the same peptide length and is amidated. Belongs to the frog skin active peptide (FSAP) family. Frenatin subfamily.