For example, a B‐ALL sample with a BCR‐ABL t(9;22) stem‐line clone (detected by both NS and CD19S FISH), also contained rare (previously detected) subclones with monosomy 7 and deletion 7q, that in this instance were detected only by CD19S FISH (Table 2 and Table S1, Sample 5). This evidence concerns the gene BCR and acute lymphoblastic leukemia.