NUDT9 and cancer: Interestingly, NUDT4, NUDT5, NUDT6, NUDT7, NUDT8, and NUDT9 were assigned to the same cluster when considering data from the three cancer cell lines together (Fig. 8e, f); however, when examining data collections limited to A549 (Fig. 8g, h) or MCF7 (Fig. 8i, j), these enzymes were assigned to two or three separate clusters, respectively.