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1H,I) than in the 0-year-old alligators. NGF-positive cells in the spinal cord were mostly found in the gray matter and rarely found in the white matter. NGF-positive cells were plentiful in the gray matter, of the 0-year-old animals. They had small cell bodies, and were stained yellow (Fig. 1J); Fewer cells were founds in the 1- and 2-year-old animals but the cells that were present were slightly larger than those in neonates (Fig. 1K,L). Levels of NGF protein gradually increased in the cerebrum during the first 2 years of life. Similar levels of increases but with lower expression levels were found in the midbrain. The increase in NGF protein in the cerebellum was significantly different (P? http://www.selleckchem.com/products/Adrucil(Fluorouracil).html a slight increase being apparent between 1 and 2 years in age. NGF protein levels in the spinal cord, http://en.wikipedia.org/wiki/MERTK decreased during development, predominantly between years 1 and 2 (Fig. 2). The development of the central nervous system of the Yangtze alligator originates from the neural tube. The frontal end of the neural tube forms the anterior, middle and posterior brain vesicles, which respectively form the cerebrum, midbrain and cerebellum. The lower end of the neural tube develops into the spinal cord. We demonstrated that NGF-positive cells present in the cerebral cortex of the neonatal Yangtze alligator were concentrated in the molecular layer and were rarely found in the exterior plexiform or cell layers. In the 1-year-old animals, http://www.selleckchem.com/products/SRT1720.html NGF-positive cells increased in number and size of in the molecular layer and in the 2-year-old animals increased populations of NGF-positive cells were present in the plexiform and cell layers of the thickened cerebral cortex. These findings in Fig. 3 indicate that the cerebral cortex of the Yangtze alligator undergoes, at least, until 2 years after hatching. Positive staining of cortical cell membranes and plasma suggests that NGF-positive cells play an important role in the growth of neural cells. Our data showed the following differentiation some of the cells extended toward the exterior plexiform and cell layers, evidenced by the presence of small overall cell size, and protruding processes at the two ends. Based on these findings we suggest that NGF-positive cells may be involved in the formation of cerebral cortical neural cells, either by transforming themselves or by stimulating the transformation of other cells. We also suggest that the formation of extracellular processes may be associated with the construction of cerebral cortical networks. Our findings are supported by those of other workers, who have reported that NGF-positive cells show evidence of dense, compact packing, in the cerebral cortex of 1- and 2-year-old alligators (Ernfors et al., 1990).