p21 restricts influenza A virus by perturbing the viral polymerase complex and upregulating type I interferon signaling. - Ma, Chao; Li, Yuhan; Zong, Yanan; Velkov, Tony; Wang, Chenxi; Yang, Xinyu; Zhang, Ming; Jiang, Zhimin; Sun, Haoran; Tong, Qi; Sun, Honglei; Pu, Juan; et al. (PLoS Pathogens, 2022)