Among other candidates of H3.1‐interactors (Figure 6, Table S3), the PHD finger protein (AT4G23860) was identified as a homologue of human histone H3‐binding UBR7 E3 ubiquitin ligase, which mediates K120 ubiquitination of histone H2B and acts as breast cancer tumour suppressor (Kleiner et al., 2018; Adhikary et al., 2019). Here, UBR7 is linked to breast cancer.