SRP404481 PRJNA894189 GSE216542 scRNA-seq, snATAC-seq, and spatial transcriptomics analysis of mammary glands of aged female mice Aging results in changes in mammary gland cell proportions, gene expression, and chromatin accessibility. Cell types captured include epithelial, immune, and stromal cell types. Overall design: Mammary gland 3M and 18M old virgin female C57BL/6J mice were enzymatically and mechanically digested. Single cells were FACS-sorted based on viability prior to performing scRNA-seq (10X Chromium v.3 chemistry) and snATAC-seq (10X Chromium v.1) GSE216542 pubmed 39587369