Stem cell PCR array revealed genes differentially expressed in LG epithelium and mesenchyme. Total RNA was prepared from E16.6 enzymatically separated LG epithelium and mesenchyme. Relative expression was calculated using the household genes provided in the array. Bars represent means ± SEM of two experiments. LG epithelium was enriched with expression of collagen, type II, alpha 1 (Col2a1), keratin 15 (Krt5), cadherin 1 (Cdh1), fibroblast growth factor 1 (Fgf1), gap junction protein, beta 1 (Gjb1), Cyclin D1 (CcnD1), delta-like 1 (Dll1), myelocytomatosis oncogene (Myc), aldehyde dehydrogenase family 1, subfamily A1 (Aldh1a1), membrane metalloendopeptidase (Mme), cell division cycle 42 homolog (Cdc42), Cyclin A2 (Ccna2). LG mesenchyme was enriched with expression of peroxisome proliferator activated receptor gamma (Pparg), fibroblast growth factor 2 (Fgf2), insulin-like growth factor 1 (Igf1), chemokine (C-X-C motif) ligand 12 (Cxcl12), S100 protein, beta polypeptide (S100b), CD44 antigen (CD44), aldehyde dehydrogenase family 1, subfamily A1 (Aldh1a1), bone morphogenetic protein 3 (Bmp3), aggrecan (Acan), CD4 antigen (CD4), bone morphogenetic protein 2 (Bmp2), ATP-binding cassette, subfamily G (WHITE), member 2 (Abcg2), delta-like 3, (Dll3), CD3 antigen, delta polypeptide (CD3d), desert hedgehog (Dhh), actin, alpha, cardiac muscle 1 (Actc1), CD8 antigen, alpha chain (CD8a).