Epidermin is a type A lantibiotic that is a tetracyclic 21-amino-acid peptide which contains meso-lanthionine, 3-methyllanthionine, and S-(2-aminovinyl)-D-cysteine. It is obtained from Staphylococcus epidermidis Tue 3298 and exhibits antibiotic activity against many Gram-positive bacteria. It has a role as a metabolite and an antibacterial agent.