Horizontal gene transfer in <it>Histophilus somni </it>and its role in the evolution of pathogenic strain 2336, as determined by comparative genomic analyses oleh Siddaramappa Shivakumara, Challacombe Jean F, Duncan Alison J, Gillaspy Allison F, Carson Matthew, Gipson Jenny, Orvis Joshua, Zaitshik Jeremy, Barnes Gentry, Bruce David, Chertkov Olga, Detter J Chris, Han Cliff S, Tapia Roxanne, Thompson Linda S, Dyer David W, Inzana Thomas J