passages.id: split_1_test_1150_passage
passages.type: progene_text
passages.text: Oncogenic transformation of fibroblasts by the src oncogene has long been known to cause an increase in the size of cell - surface protein - bound oligosaccharides , owing primarily to increased N - glycan branching mediated by increased beta-1,6-N-acetylglucosaminyltransferase V ( GnT V ) activity .