Wullems, G.J.

chromosome hamster medium chinese hat medium chinese hamster cells experiment activity transfer incubation hprt activity colony clone donor x chromosome wg 3-h cells metaphase result cell lines nonselective medium channel system hybrid enzyme incorporation uptake metaphase chromosomes presence chinese hamster nonselective isolation g 6pd phenotype mouse electrophoretic hela chromosomes flo medium fragment hypoxanthine hela cells number expression electrophoresis 3 cells genome electrophoretic pattern publication frequency study growth treatment table transformation thymidine mouse cells technique chromosomal pattern cell res appendix nature material hat-resistant clones donor dna gene transfer population culture van der horst chromosomen sendai virus hrb 28 cells interphase origin observation preparation coding procedure tk activity h-hrb 8 weeks