Toxic and nontoxic components of botulinum neurotoxin complex are evolved from a common ancestral zinc protein
Ken Inui, Yoshimasa Sagane, Keita Miyata, Shin-Ichiro Miyashita, Tomonori Suzuki, Yasuyuki Shikamori, Tohru Ohyama, Koichi Niwa, Toshihiro Watanabe