Enrichment analysis of biological processes related to genes regulated by OHT in combination with ATRA. Statistically significantly enriched biological processes based on Gene Ontology enrichment analysis, with the number of corresponding genes, upon treatment of MCF7-WT (A) MCF7-ERβ1 (B) and MCF7-ERβ2 cells (C) with OHT in combination with ATRA. The number of significantly differentially expressed genes involved in each process is shown on the X axis, with red and blue colors corresponding to up- or downregulation, respectively. Cell-death-related processes are indicated with dots. OHT, 4-hydroxytamoxifen; ATRA, all-trans retinoic acid.