1. Jacobson, M., Developmental Neurobiology (Plenum, New York, 1978).
2. Buskirk, D. R., Thiery, J.-P., Rutishauser, U. & Edelman, G. M. Nature 285, 488–489 (1980).
3. Gaze, R. M., Keating, M. J., Ostberg, A. & Chung, S.-H. J. Embryol. exp. Morph. 53, 39–66 (1979).
4. Constantine-Paton, M. in Developmental Order: Its origin and Regulation (eds Subtelny, S. & Green, P. B.) 317–349 (Liss, New York, 1982).
5. Holt, C. E. J. Neurosci. 4, 1130–1152 (1984).