Equine stomachs harbor an abundant and diverse mucosal microbiota - Perkins, G A; den Bakker, H C; Burton, A J; Erb, H N; McDonough, S P; McDonough, P L; Parker, J; Rosenthal, R L; Wiedmann, M; Dowd, S E; Simpson, K W (Appl Environ Microbiol, 2012)