HER2/PD1 bispecific antibody in IgG4 subclass with superior anti‐tumour activities. Issue 4 (5th April 2022) - Chu, Wendi; Xu, Hui; Wang, Yanfei; Xie, Yongle; Chen, Yi‐Li; Tan, Xiaorong; Huang, Chenghao; Wang, Guifeng; Wang, Qi; Luo, Wenxin; Xia, Ningshao; Geng, Meiyu; et al.