More consistent results have been found with other important gene. The emerging, but still tentative, view of jaw evolution based on this molecular evidence is that the mandibular arch of jawless fishes became divided the dorsal part contributing to the neurocranium and the remainder evolving into the mandible proper of gnathostomes. This is closest to the composite theory but differs in detail, which remains to be settled. Nevertheless, all these views share the same basic consensus: namely, that in general the vertebrate jaws are derivatives of ancient gill arches