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Expression of Gix surface antigen on thymocytes is an inherited mendelian train of certain strains of mice. We report here the following new findings: (a) Gix antigen was found free in the serum of Gix+ mouse strains. (b) Expression vs. nonexpression of Gix antigen was invariably correlated with presence or absence of the group-specific antigen of Murine leukemia virus (MuLV) gp69/71 in the serum of mice of inbred and segregating populations. (c) Gix antigen could be removed from normal Gix+ mouse serum by precipitation with antiserum to MuLV gp 69/71. (d) Anti-gp69/71 serum was weakly cytotoxic for Gix+ thymocytes, and partially blocked the cytotoxic activity of Gix antibody for Gix+ thymocytes. (e) Purified AKR virus absorbed Gix activity, and disruption of the virions did not increase their absorbing capacity. These serological data indicate that Gix antigen is a constituent of gp69/71, the glycoprotein which is the major component of the MuLV envelope. On present evidence, Gix antigen is represented in intact virions and is probably accessible to Gix antibody.

Relation of GIX antigen of thymocytes to envelope glycoprotein of murine leukemia virus.