Experimental duplication of bilaterian body axes in spider embryos: Holm’s organizer and self-regulation of embryonic fields

Bilaterally symmetric body plans of vertebrates and arthropods are defined by a single set of two orthogonal axes, the anterior-posterior (or head-tail) and dorsal-ventral axes. In vertebrates, and especially amphibians, complete or partial doubling of the bilaterian body axes can be induced by two...

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