CST7（cystatin F），癌症关联基因，基因ID：8530，胱抑素超家族包含含有多种胱抑素样序列的蛋白质一些成员是活性半胱氨酸蛋白酶抑制剂，而其他成员已经失去或可能从未获得这种抑制活性在超家族中有三个抑制家族，包括1型半胱氨酸蛋白酶抑制剂（stefins）、2型半胱氨酸蛋白酶抑制剂和激肽原2型半胱氨酸蛋白酶抑制剂是一类半胱氨酸蛋白酶抑制剂，存在于多种体液和分泌物中。该基因编码一种糖基化半胱氨酸蛋白酶抑制剂，通过抑制造血系统中的一个独特靶点，可能在免疫调节中发挥作用。该蛋白在恶性肿瘤细胞系中的表达已被观察到。[由RefSeq提供，2008年7月]The cystatin superfamily encompasses proteins that contain multiple cystatin-like sequences. Some of the members are active cysteine protease inhibitors， while others have lost or perhaps never acquired this inhibitory activity. There are three inhibitory families in the superfamily， including the type 1 cystatins (stefins)， type 2 cystatins and the kininogens. The type 2 cystatin proteins are a class of cysteine proteinase inhibitors found in a variety of human fluids and secretions. This gene encodes a glycosylated cysteine protease inhibitor with a putative role in immune regulation through inhibition of a unique target in the hematopoietic system. Expression。