The polymerase chain reaction was used to survey the oligochaete worm Stylaria lacustris for HOM/Hox type homeobox genes. Twelve fragments were identified and in most cases were assignable to cognate groups on the basis of amino acid similarity. Stylaria appears to have three labial-type genes, a HOX B3 cognate, several genes similar to Antennapedia, and cognates of Abdominal-B and CHox7.
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Snow et al. (1994) studied this question.
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