ALL-trans retinoic acid (RA) is well known as a biologically active form of vitamin A and a
teratogen 1-8 . The identification of nuclear receptors for this ligand 9-11 suggests strongly that …

One of the most important reasons why the problem of headtail patterning has eluded a solution
is that it is not even easy to define this axis precisely in the vertebrate embryo. Although …

RETINOIDS (vitamin A and its metabolites) are suspected of regulating diverse aspects of
growth, differentiation, and patterning during embryogenesis 1 , but many questions remain …

Background The Hox genes are involved in patterning the anterior-posterior axis. In addition
to the protein coding Hox genes, the miR-10, miR-196 and miR-615 families of microRNA …

Hox collinearity is a spectacular phenomenon that has excited life scientists since its discovery
in 1978. Two mechanisms have been proposed to explain the spatially sequential pattern …

This article is concerned with the roles of retinoids and other known anterior–posterior
morphogens in setting up the embryonic vertebrate anterior–posterior axis. The discussion is …

It is generally assumed that the characteristic deregionalized body plan of species with a
snake-like morphology evolved through a corresponding homogenization of Hox gene …

This paper reports an investigation of the pacemaker regions which organize cell aggregation
in the cellular slime mold Dictyostelium discoideum. Observations are made of time …

This paper introduces some experimental investigations of wave propagation during
aggregation of the cellular slime mould Dictyostelium discoideum (Dd) (Durston, unpublished …

Most ERP studies on facial expressions of emotion have yielded inconsistent results regarding
the time course of emotion effects and their possible modulation by task demands. Most …