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In early metamorphic climax the increased frequency of elongated and metachromatic mast cells in the medial septal area was remarkable (Fig.?3h). At stage 32/33 (advanced metamorphic climax �C newly metamorphosed froglets), the brain contained a remarkable number of strongly metachromatic big-sized mast cells in close association with the epithelial lining of the anterior choroid plexus (Fig.?3i). At this stage of development, mast cells appeared more mature than those observed in the earlier stages of development, and were often considerably bigger in size (diameter of about 15?��?2?��m; nuclear diameter 5?��?1), with an elongated shape; the cells showed an intense metachromasia with toluidine blue (Fig.?3j) and were strongly safranin-positive (Fig.?4b). Mast cells were abundant in the telencephalon. http://en.wikipedia.org/wiki/MYO10 Here, they were distributed mainly along the medial septal meningeal lining, some within lateral ventricles and others in close association with blood vessels. Many mast cells were observed in the diencephalon region, associated with the anterior choroid plexus, ventricular ependymal lining in the infundibular recess as well as ventrally in the pia mater surrounding the brain. A few mast cells were observed in the mesencephalon, within the optic ventricles. Strongly metachromatic and slightly elongated mast cells were observed at the level of the cerebellum (Fig.?3k), in the pia mater. In the rhombencephalon, other mast cells were present along the ependymal lining of the fourth ventricle, in blood vessels entering the brain tissue and in the posterior choroid plexus (Fig.?3l). Mast cell number increased from 0.05?��?0.01 mast cells per http://www.selleckchem.com/products/poziotinib-hm781-36b.html section in stage group 22/23 to 0.25?��?0.04 mast cells per section in stage group 26/28 (Fig.?2). Mast cell number at stage 32/33 (1.8?��?0.4 mast cells per section) increased significantly (P? http://www.selleckchem.com/products/bay80-6946.html pre-metamorphosis), mast cells were observed in all brains examined. In the telencephalon, mast cells were metachromatic with toluidine blue and roundish or oval in shape; some such cells were always associated with the olfactory bulbs (Fig.?5c). In the diencephalon, a few mast cells were present in the dorsal region, closely associated with epiphysis and precisely located in the meningeal lining. At stage 57/58 of development (advanced pre-metamorphosis), the brain mast cells appeared metachromatic (Fig.?5e) and weakly safranin-positive, although a few were rich in granules and showed a rather roundish morphology.