MALDI-TOF MS analysis of the antimicrobial agent isolated from Brevibacillus laterosporus OSY-I1. The ions at m/z (z = 1) 1,584.1, 1,606.1, and 1,622.1 represent the singly protonated [M + H]+, sodium-cationized [M + Na]+, and potassium cationized [M + K]+ adducts, respectively.