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Friend病毒中的SFFV(spleen focus-formingvirus)是一种有缺陷的鼠类C型逆转录病毒,其外壳基因编码的膜糖蛋白(gp55)是诱发体内白血病和体外红细胞增殖不可缺少的蛋白。
Friend virus virus SFFV (spleen focus-forming virus) is a defective murine C-type retrovirus, its envelope gene encoding membrane glycoprotein (gp55) is induced in vivo leukemia and in vitro red blood cell proliferation is indispensable protein.