Source:http://linkedlifedata.com/resource/umls/id/C0025544
MSH: Proteins that have one or more tightly bound metal ions forming part of their structure. (Dorland, 28th ed),CSP: note that individual metalloproteins have not been exhaustively treed under this term.,NCI: Proteins that include a metal ion as part of their structure or they contain a metal cofactor. The metal ion can be an isolated ion or coordinated with a nonprotein organic compound, such as the porphyrin moiety found in hemoproteins. Additionally, the metal can be co-coordinated with both a side chain of the protein and an inorganic nonmetallic ion.