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Mulligan RC, Berg P. Expression of a bacterial gene in mammalian cells. Science 209: 1422-1427, 1980. PubMed: 6251549

Mulligan RC, Berg P. Selection for animal cells that express the Escherichia coli gene coding for xanthine-guanine phosphoribosyltransferase. Proc. Natl. Acad. Sci. USA 78: 2072-2076, 1981. PubMed: 7017722