We thank Connie Russell and Dr. M. Burg for their earlier work with a cosmid clone and Dr. G. Koliantz for his help in cytological experiments. We express our gratitude to Drs. T. C. Kaufman, P. Salvaterra, J. Tamkun, G. Cutting, and R. ffrench-Constant for kindly providing us with the DNA clones used in our study. Ann Pellegrino assisted in the preparation of the manuscript. This work was supported by grant MH 49727 from the National Institute of Mental Health and grant EY00033 from the National Eye Institute.

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