Accumulation of mutations in nsp4, E, and the S2 subunit underlies mammalian cell tropism expansion and virulence attenuation of avian coronavirus. - Li, Yingfei; Zhang, Xuehui; Liang, Rong; Li, Ruotong; Yang, Ruihua; Zhang, Liwei; Zhao, Ye; Zhang, Guozhong; Zhao, Jing (PLoS Pathogens, 2026)