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J.L.R. Rubenstein and L. Puelles, Homeobox Gene Expression during Development of the Vertebrate Brain.A. Fjose, Homeobox and paxGenes in Zebrafish Development.D.A. Weisblat, C.J. Wedeen, and R.G. Kostriken, Evolution of Developmental Mechanisms: Spatial and Temporal Modes of Rostrocaudal Patterning.C.-B. Chien and W.A. Harris, Axonal Guidance from Retina to Tectum in Embryonic Xenopus.R.R. Behringer, The in Vivo Roles of Mullerian-Inhibiting Substance.P.J. Donovan, Growth Factor Regulation of Mouse Primordial Germ Cell Development.J.D. Gold and R.A. Pedersen, Mechanisms of Genomic Imprinting in Mammals.U. Eichenlaub-Ritter, Mechanisms of Nondisjunction in Mammalian Meiosis.E.M. Lord, W. Crone, and J.P. Hill, Timing of Events during Flower Organogenesis: Arabidopsis as a Model System.References.Subject Index.