3D culture and cryopreservation/thawing strategy of human induced pluripotent stem cells for spaceflight experiments - Jingtong Xie; Chiyuan Ma; Yanbang Wei; Junyi Luo; Yongfan Men; Linjun Wang; Yue Xiong; Weibo Zheng; Xiaohua Lei (Life Sciences in Space Research, 2026)