has role has role is conjugate acid of independent continuant ammonia cofactor ammonium NH4(+) Wikipedia:Ammonium ammonium CHEBI:7435 [NH4](+) chebi_ontology MetaCyc:AMMONIUM MolBase:929 KEGG:C01342 CHEBI:49783 ammonium NH(4)(+) ammonium cation ammonium ion An onium cation obtained by protonation of ammonia. PDBeChem:NH4 Ammonium(1+) CHEBI:28938 CHEBI:22534 NH4+ nitrogen hydride onium cation monovalent inorganic cation Saccharomyces cerevisiae metabolite Escherichia coli metabolite human metabolite