| Provider Name | Provider Code | URI |
|---|---|---|
| OntoSpecies - Chemical Species Ontology for Data Integration and Knowledge Discovery | worldavatar.os |
http://www.theworldavatar.com/ontology/ontospecies/OntoSpecies.owl#Charge |
| Bioregistry | bioregistry |
https://bioregistry.io/worldavatar.os:Charge |