本文介绍的一种新型抗肿瘤蛋白质因子是本室从牛骨髓细胞中分离得到的一种具有明显抑制肿瘤细胞生长作用的新型蛋白质￣［１］，经测定，该蛋白质为一种分子量约为６５ＫＤ的糖蛋白，我们在此基础上进行了该蛋白质的氨基酸组成分析，测得其含有十六种氨基酸残基，井富含丝氨酸残基。 This article describes a new type of anti-tumor protein factor is isolated from the bovine bone marrow cells in this room with a clear inhibitory effect on tumor growth of new proteins [1], the protein was determined to be a molecular weight of about 65KD Of the glycoprotein on the basis of which we analyzed the amino acid composition of the protein and found that it contains 16 kinds of amino acid residues and that the well is rich in serine residues.