The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at http://www.ebi.ac.uk/chebi/. The data is made available under the Creative Commons License (CC BY 3.0, http://creativecommons.org/licenses/by/3.0/). For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.
An elementary particle of spin 1/2, zero electric charge and negligible rest mass. Three known types (flavors) of neutrino are electron neutrino, muon neutrino and tau neutrino, named after their charged partner leptons. The term 'neutrino' has been coined by Enrico Fermi.