| x um bbd_reactionid | http://bio2rdf.org/obo_vocabulary:x-um-bbd_reactionid | | |
| x unipathway | http://bio2rdf.org/obo_vocabulary:x-unipathway | | |
| x vz | http://bio2rdf.org/obo_vocabulary:x-vz | | |
| x wbbt | http://bio2rdf.org/obo_vocabulary:x-wbbt | | |
| x wikipedia | http://bio2rdf.org/obo_vocabulary:x-wikipedia | | |