the upstream region of the ifn-regulated human gene 6-16 was fused to the escherichia coli guanine phosphoribosyltransferase ( gpt ) gene and transfected into hypoxanthine-guanine phosphoribosyltransferase-negative human cells .
C1415701
guanine phosphoribosyltransferase
C0020687
hypoxanthine-guanine phosphoribosyltransferase