Single-cell analysis reveals the metabolic characteristics of porcine trophoblast cells during early pregnancy - Yuhao Qiu; Xupeng Zang; Junying Ai; Yue Ding; Yongzhong Wang; Ting Gu; Ruhai Xu; Gengyuan Cai; Lihe Dai; Linjun Hong (Theriogenology, 2026)