Supplementary Table 1. mRNA signature for LXR/RXR activation based on unsupervised differential gene expression analysis of isolated mammary epithelial cells (MECs).

This signature indicates many LXR/RXR target genes are robustly upregulated between functional differentiation in pregnancy (P14, pregnant day 14) and post-secretory activation in established lactation (L4, lactation day 4), suggesting that LXR/RXR dimers are activated.