Quantitative analysis of transcript abundance among the three sub-populations of OR genes confirmed that the genes associated with breast cancer cell proliferation (MKI67, AURKA, BIRC5, CCNB1, MYBL2) were significantly abundant in sub-population I with OR2B6 upregulation (Figs 4B and S4A–C). The gene discussed is CCNB1; the disease is breast cancer.