Short-range signaling by candidate morphogens of the TGF beta family and evidence for a relay mechanism of induction - PubMed (original) (raw)
Short-range signaling by candidate morphogens of the TGF beta family and evidence for a relay mechanism of induction
K M Reilly et al. Cell. 1996.
Free article
Abstract
The specification and patterning of cell fates by a morphogen gradient is a unifying theme of developmental biology, yet little evidence exists for the presence of gradients in vivo or to show how such putative gradients form. Vg1 and activin are candidate morphogens involved in Xenopus mesoderm induction. This study suggests that these TGF beta family members act on adjacent cells but do not travel through the intact extracellular space to induce distant cells directly. Moreover, we present evidence for the presence of secondary inducing signals that could be involved in relaying signals to distant cells. These results suggest that if a localized cellular source of an inducer acts to pattern mesodermal cells at a distance in Xenopus embryos, it does so by a relay mechanism.
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