Pan-family pollen signals control an interspecific stigma barrier across Brassicaceae species. - Cao, Yunyun; Cui, Xiaoshuang; Yang, Yinqing; Pan, Lianhui; Yang, Fei; Li, Shuyan; Wu, Dandan; Ding, Yuelan; Chen, Rui; Wang, Nan; Liu, Shangjia; Ji, Zhaojing; et al. (Science, 2026)