[1] UNIV MED & DENT NEW JERSEY, NEW JERSEY MED SCH, DEPT NEUROSCI, NEWARK, NJ 07103 USA
[2] INT INST GENET & BIOPHYS, ZOOL STN, NAPLES, ITALY
[3] NIMH, NEUROBIOL LAB, BETHESDA, MD 20205 USA
[4] MARINE BIOL LAB, WOODS HOLE, MA 02543 USA
[5] INST DEV DISABILITIES, DEPT PATHOL BIOCHEM, STATEN ISL, NY 10314 USA