part_of part of part of only in taxon contributes to morphology of Vertebrata <vertebrates> Danio rerio Homo sapiens pons http://upload.wikimedia.org/wikipedia/commons/3/36/Gray768.png The pons is not present in zebrafish. In this ontology we currently have some structures which are applicable to zebrafish appearing as parts of the pons. Currently we only include the weaker dubious_for_taxon relationship ubtil this is resolved metencephalon brainstem regional part of brain