Insertion of IS4Bsu1 or IS1182Bsu1 into the oligopeptide-permease gene cluster reduces γ-polyglutamic acid production in Bacillus subtilis subsp. natto. - Noguchi M; Tanizaki Y; Kudo K; Yakabe S; Kojima K; Hira D; Kadooka C; Ekino K; Nakayama Y; Oka T (Food microbiology, 2025)