Increased OCT4 expression in Day 5 blastocysts may explain the increased clinical outcomes of D5 versus D6 blastocyst transfers. - Lee, Jui-Hua; Chang, Wei-Fang; Tzeng, Shang-Yu; Lee, Yi-Xuan; Tan, Shun-Jen; Wang, Ruey-Sheng; Ho, Jason Yen-Ping; Lin, Shyr-Yeu; Hwu, Yuh-Ming; Tzeng, Chii-Ruey (Human Reproduction, 2026)