.Publisheru00e2 $ s note Springer Nature continues to be neutral for supervisory insurance claims in published maps and institutional affiliations.This is a summary of: Bhat-Nakshatri, P. et cetera. Single-nucleus chromatin access and transcriptomic map of boob tissues of women of unique genetic ancestral roots. Nat. Med. https://doi.org/10.1038/s41591-024-03011-9 (2024 ).