Stepwise differentiation from precursor intermediates and distinct Th1 checkpoints promote CD4 Th1 cell differentiation during chronic viral infection - Hongshen Niu; Siying Lin; Ryan Brown; Jian Shen; Arjun Kharel; Yuqi Zhang; Kexin Gai; Ashley Bauer; Ashley Brown; Ziyang Xu; David G. Brooks; Weiguo Cui (Proceedings of the National Academy of Sciences, 2026)