Umbilical Cord Mesenchymal Stem Cell–Derived Exosomes Preserve Melanocyte Stem Cell Integrity Under Acute Neurogenic Oxidative Stress via Activation of the Nrf2–ARE Pathway in C57BL/6J Mice. - Cui, Jingbo; Duan, Linxia; Qu, Hui; Ning, Jing; Li, Zhi; Zhang, Huihua (Journal of Cosmetic Dermatology, 2026)