Contents Continued

Drosophila regulatory factor X is an embryonic type I sensory neuron marker also expressed in spermatids and in the brain of Drosophila 159 Preferential expression of Mdm2 oncogene during the development of neural crest and its derivatives in mouse early embryo-genesis 163 Wnt receptors and Wnt inhibitors are expressed in gradients in the developing telencephalon 167 Localization of the netrin guidance receptor, DCC, in the developing peripheral and enteric nervous systems 173 Tissue-speci®c expression of the transcriptionally regulated serum and glucocorticoid-inducible protein kinase (Sgk) during mouse embryogenesis 177 Periostin (an osteoblast-speci®c factor) is expressed within the embryonic mouse heart during valve formation 183 Xenopus Eya1 demarcates all neurogenic placodes as well as migrating hypaxial muscle precursors 189 Protein kinase C isoenzyme: selective expression pattern of protein kinase C-u during mouse development 197