Schematic colorized drawings of individual ppRb isoform expression in newborn mouse M1 molar and incisor teeth. ppRbS780 expression is indicated in red, ppRbS795 expression is shown in yellow, and ppRbS807/811 expression is indicated in blue. Overlapping expression of ppRbS780 and ppRbS795 is indicated in orange (Panel b, ameloblast, am). Abbreviations: am, ameloblast; bm, basement membrane; DE, dental epithelium; dp, dental papilla; ds, dental sac; Lab. CL, labial cervical loop; Lin. CL, lingual cervical loop; od, odontoblast; oee, outer enamel epithelium; pa, pre-ameloblasts; si, stellate reticulum; sr, stellate reticulum.