Abstract: Selenium, an essential trace element, has a long history of association with human health and diseases and exerts its important biological role as selenocysteine residue in selenoproteins.

• 摘要: 硒是人体中必需的微量元素，它与各种疾病和人类健康息息相关。硒在生物体内以硒代半胱氨酸形式表现其生理活性和功能。