Summary: Resolution of ultrafine anaphase bridges (UFBs) must be completed before cytokinesis to ensure sister-chromatid disjunction. RIF1 is involved in UFB resolution by a mechanism that is not yet clear. Here. we show that RIF1 functions in mitosis to inhibit the formation of 53BP1 nuclear bodies and micronuclei. https://storeanimalwiz.shop/product-category/in-line/