UHRF1 and breast cancer: In human U2OS osteosarcoma, human MCF7 breast cancer, mouse C127 mammary gland and mouse NIH-3T3 fibroblast cells a significantly smaller fraction showed co-localization of mCherry-hUHRF1 (13%, 34%, 19% and 13%, respectively) and mCherry-mUHRF1 V2 (10%, 21%, 23% and 17%, respectively) with H3K9me3 when compared to mCherry-mUHRF1 V1 (35%, 71%, 53% and 36%, respectively).