Abstract
Thioxanthine is toxic for mammalian cells transformed by the dominant selectable marker gpt. It allowed us to select, in the presence of the endogenous hypoxanthine-guanine phosphoribosyltransferase gene, mutants that did not express gpt any more and also hybrid cells that had lost the chromosome carrying it. The gpt marker is thus dominant in negative as well as in positive selection, which makes it potentially very useful for genetic studies of mammalian cells.
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