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To investigate the protective effect of chondroitin sulfate nano-selenium (SeCS) on chondrocyte of Kashin-Beck disease (KBD). Chondrocyte samples were isolated from the cartilage of three male KBD patients (54-57 years old). The chondrocytes were respectively divided into four groups (a) control group, (b) SeCS supplement group (100 ng/mL SeCS), (c) T-2 + SeCS supplement group (20 ng/mL T-2 + 100 ng/mL SeCS), and (d) T-2 group (20 ng/mL T-2). Live/dead staining and transmission electron microscopy (TEM) were used to observe cell viabil