Stanley P , et al. Selection and characterization of eight phenotypically distinct lines of lectin-resistant Chinese hamster ovary cells. Cell 6: 121-128, 1975. PubMed: 1182798 Stanley P , et al. Chinese hamster ovary cells selected for resistance to the cytotoxicity of phytohemagglutinin are deficient in a UDP-N-acetylglucosamine-- glycoprotein N-acetylglucosaminyltransferase activity. Proc. Natl. Acad. Sci. USA 72: 3323-3327, 1975. PubMed: 1059116