Requirement of Smad4 from Ocular Surface Ectoderm for Retinal Development. - Li, Jing; Wang, Shusheng; Anderson, Chastain; Zhao, Fangkun; Qin, Yu; Wu, Di; Wu, Xinwei; Liu, Jia; He, Xuefei; Zhao, Jiangyue; Zhang, Jinsong (PLoS ONE, 2016)