Reply to Comment on Shen H, et al. “Co-signaling receptors regulate T-cell plasticity and immune tolerance”. Frontiers in Bioscience-Landmark. 2019; 24: 96–132 - Haitao Shen; Na Wu; Gayani Nanayakkara; Hangfei Fu; Qian Yang; William Y. Yang; Angus Li; Yu Sun; Charles Drummer IV; Candice Johnson; Ying Shao; Luqiao Wang; et al. (Frontiers in Bioscience-Landmark, 2021)