OBC:Contents page

J. Croce, G. Lhomond, C. Gache (France) Coquillette, a sea urchin T-box gene of the Tbx2 subfamily, is expressed asymmetrically along the oral–aboral axis of the embryo and is involved in skeletogenesis 561 S.J. Gaunt, D. Drage, A. Cockley (UK) Vertebrate caudal gene expression gradients investigated by use of chick cdx-A/lacZ and mouse cdx-1/lacZ reporters in transgenic mouse embryos: evidence for an intron enhancer 573