Thymoquinone also downregulates the expressions of containing plant homeodomain (PHD) and really interesting new gene (RING) finger domains 1 DNMT1,3A,3B, (UHRF1), HDAC1,4,9, G9A, KMT2A,B,C,D,E, and KDM1B genes in Jurkat cells and MDA‐MB‐468 cancer cell lines (Qadi et al., 2019). Here, HDAC1 is linked to cancer.