Abstract
Recent studies reveal preliminary insights into the mechanisms of embryonic patterning in Caenobabditis elegans. It appears that both embryonic axes and early blastomere fates are determined by a combination of segregating determinants and cell interactions, under the control of maternally expressed genes. Later in embryogenesis, some regional identities are specified by a group of homeotic selector genes homologous to the HOM-C clusters in other animals. Interviewing stages of specification, which could link these two classes of genes in a regulatory hierarchy, are beginning to be investigated.
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