Downregulation of the cysE/cysK genes of Clostridioides difficile induced by cysteine revealed the response of bacteria to iron homeostasis. - Gu, Wenpeng; Liao, Feng; Bai, Lulu; Zhang, Wenzhu; Jia, Senquan; Yin, Jianwen; Zhou, Yongming; Fu, Xiaoqing; Wu, Yuan (BMC Microbiology, 2025)