cosmid vectors have been developed which carry selective markers for growth in bacteria ( beta lactamase gene ) and animal cells ( the herpes simplex virus thymidine kinase gene , the transposon tn-5 aminoglycosyl 3 ' phosphotransferase gene and the e. coli guanine phosphoribosyltransferase gene ) .
C0004611
bacteria
C0597979
beta lactamase