The evolutionary history of placodes: a molecular genetic investigation of the larvacean urochordate _Oikopleura dioica_.
-[[!pmid 16120641 desc="Animals fed with algal concentrates. _O. dioica_ has one orthologue of _eyes absent_, _Eya_, and one orthologue of the vertebrate _Pitx_ genes, with multiple promoters and alternative splice sites, and lacking an OAR domain. It has three _sine oculis_ orthologues, _Six1/2_, _Six3/6a_ and _Six3/6b. They are not clustered like vertebrate genes, but the two _Six3/6_ share an intron position in their homeodomain. Expression pattern of these genes support the hypothesis that _O. dioica_ has a placode that is homologous to the vertebrate olfactory placode."]]
+[[!pmid 16120641 desc="Animals fed with algal concentrates. _O. dioica_ has one orthologue of _eyes absent_, _Eya_, and one orthologue of the vertebrate _Pitx_ genes, with multiple promoters and alternative splice sites, and lacking an OAR domain. It has three _sine oculis_ orthologues, _Six1/2_, _Six3/6a_ and _Six3/6b_. They are not clustered like vertebrate genes, but the two _Six3/6_ share an intron position in their homeodomain. Expression pattern of these genes support the hypothesis that _O. dioica_ has a placode that is homologous to the vertebrate olfactory placode."]]