Constitutively active glucagon receptor drives high blood glucose in birds - Chang Zhang; Xiangying Xiang; Jian Liu; Yongjie Huang; Jingwen Xue; Qian Sun; Song Leng; Shaobo Liu; Xuefei He; Peng Hu; Xiangjiang Zhan; Qiang Qiu; et al. (Nature, 2025)