Localization of TRIP-1 in postnatal developing teeth. Localization of TRIP-1 in developing molars of postnatal day 1 (A), day 3 (C), day 5 (E), and day 7 (G) of tooth development. Localization of TRIP-1 in incisors of postnatal day 1 (B), day 3 (D), day 5 (F), and day 7 (H) of tooth development. Black arrows point to expression in the odontoblasts. White arrows represent expression in the ECM. P = dental pulp cells; B = bone; Od = odontoblasts; Am = ameloblasts; D = dentin; E = enamel. A,E,H bars = 20 µm; B,D,F,G bars = 10 µm; inset bar = 20 µm.