SRC and neoplasm: Tumors derived from 5-Aza-2-deoxycytidine treated cells had a lower level of methylation (60 days after tumor induction) than those derived from control untreated cells (Figure 8 This is a notable observation because in vitro, 30 days following 5-Aza-2-deoxycytidine removal, the SRC cells had reestablished a methylation level that was similar to that of control cells (Figure 1).