Enhancement of Uberon with additional content from msAOs. Shown is the representation of ‘pectoral girdle skeleton’ and related classes in Uberon post-merge. Part relations are shown in blue, subclass relations in gray. Classes originally in Uberon have a black outline. The ontology sources of the classes are indicated, as well as one class that was added post-merge in the new Ext file (‘extracleithrum’). Note that some classes were merged from multiple sources, such as the class ‘scapula’, which was in all the sources including Uberon, and ‘appendicular skeleton’, which was in VSAO, AAO, and vHOG but not Uberon or TAO. The classes with more sources are shown in increasingly dark gray.