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This is a mixture of cited references and articles to read for further details. It contains both hard-science research reports and review articles summarizing the current state of knowledge; read through the list and you'll probably find what you're looking for.
Alvarez-Buylla A. (1992). Neurogenesis and plasticity in the CNS of adult birds. Experimental Neurology. 115: 110-114.
Alvarez-Buylla A, Kirn JR. (1997). Birth, migration, incorporation, and death of vocal control neurons in adult songbirds. Journal of Neurobiology. 33: 585-601.
Bain G. Gottlieb DI. Neural cells derived by in vitro differentiation of P19 and embryonic stem cells. Perspectives on Developmental Neurobiology. 5(2-3):175-178, 1998.
Bain G. Kitchens D. Yao M. Huettner JE. Gottlieb DI. Embryonic stem cells express neuronal properties in vitro. Developmental Biology. 168(2):342-57, 1995 Apr.
Bain G. Ray WJ. Yao M. Gottlieb DI. Retinoic acid promotes neural and represses mesodermal gene expression in mouse embryonic stem cells in culture. Biochemical & Biophysical Research Communications. 223(3):691-4, 1996 Jun 25.
Bain G. Yao M. Huettner JE. Finley MFA. Gottlieb DI. Neuron-like cells derived in culture from P19 embryonal carcinoma and embryonic stem cells **In Press 1998**
Burek MJ, Nordeen KW and EJ Nordeen. March 1997. Sexually Dimorphic Neuron Addition to an Avian SCR is Not Accounted For by Sex Differences In Cell Death. Journal of Neurobiology. 33: 61-71.
Campeau, S., Miserendino, M.J.D., and Davis, M. Intra-amygdala infusion of the N-methyl-D-aspartate receptor antagonist AP5 blocks acquisition but not expression of fear-potentiated startle to an auditory conditioned stimulus. Behavioral Neuroscience. 106: 569-574. 1992.
Condie BG. Bain G. Gottlieb DI. Capecchi MR. Cleft palate in mice with a targeted mutation in the gamma-aminobutyric acid-producing enzyme glutamic acid decarboxylase 67. Proceedings of the National Academy of Sciences of the United States of America. 94(21):11451-5, 1997 Oct 14.
Fanselow, M.S., and Kim, J.J. Acquisition of contextual Pavlovian fear conditioning is blocked by application of an NMDA receptor antagonist, D,L-2-amino-5-phosphonovaleric acid to the basolateral amygdala. Journal of Neuroscience. 12: 854-863. 1994.
Golman, Steven A. (1998). Adult Neurogenesis: From Canaries to the Clinic. Journal of Neurobiology. 36: 267-286.
Hidalgo, Andrea, et al. (1995). Estrogens and non-estrogenic ovarian influences combine to promote the recruitment and decrease the turnover of new neurons in the adult female canary brain. Journal of Neurobiology. 27(4): 470-487.
Kempermann G, Kuhn HG, Gage FH (1997). More hippocampal neurons in adult mice living in an enriched environment. Nature 386: 493-495.
Kempermann G. (2002). Why New Neurons? Possible functions for adult hippocampal neurogenesis. The Journal of Neuroscience: 22(3): 635-638.
Kirn J, et al. (1994). Cell death and neuronal recruitment in the HVc of adult male canaries are temporally related to changes in song. Proceedings of the National Academy of Sciences, USA. 91: 7844-7848.
Kuhn, H. Georg, Palmer T.D., and Fuchs, Eberhard. Adult neurogenesis: a compensatory mechanism for neuronal damage. European Archives of Psychiatry and Clinical Neuroscience. 251: 152-158. 2001.
McKay R. (1997). Stem cells in the central nervous system. Science. 276: 66-71.
Nottebohm F., et al. (1994). The life span of new neurons in a song control nucleus of the adult canary brain depends on time of year when these cells are born. Proceedings of the National Academy of Sciences, USA. 91: 7849-7853.
Patel SN et al. (1997). Spatial learning induces neurogenesis in the avian brain. Behavioural Brain Research. 89: 115-128.
Ramon y Cajal. S. Cajal's Degeneration and Regeneration of the Nervous System. New York: Oxford University Press, 1991: 750
Ray WJ. Bain G. Yao M. Gottlieb DI. CYP26, a novel mammalian cytochrome P450, is induced by retinoic acid and defines a new family. Journal of Biological Chemistry. 272(30):18702-8, 1997 Jul 25.
Ray WJ. Gottlieb DI. Regulation of protein abundance in pluripotent cells undergoing commitment to the neural lineage. Journal of Cellular Physiology. 168(2):264-75, 1996 Aug.
Tanapat AJ et al. (1998). Estrogen stimulates the proliferation of granule cell precursors in the dentate gyrus of adult female rats. Neuroscience Abstracts. 24: 796-798.
Tramontin AD and Brenowitz EA (1999). A Field Study of Seasonal Neuronal Incorporation into the Song Control System of a Songbird that Lacks Adult Song Learning. Journal of Neurobiology. 40: 316-326.
Tramontin AD and Brenowitz EA (2000). Seasonal Plasticity in the Adult Brain. Trends in Neuroscience. 23: 251-258.
Vaccarino, Flora M. et al. (2001) Stem cells in neurodevelopment and plasticity. Neuropsychopharmacology. 25(6): 805-815.
Yao M. Bain G. Gottlieb DI. Neuronal differentiation of P19 embryonal carcinoma cells in defined media. Journal of Neuroscience Research. 41(6):792-804, 1995 Aug 15.