| http://www.w3.org/ns/prov#value | - A method according to claim 9 wherein the metal is a member selected from the group consisting of iron, copper, zinc, manganese, cobalt, chromium, calcium, magnesium and vanadium and is complexed with a proteinate which is an amino acid selected from the group consisting of glycine, alanine, valine, leucine, isoleucine, phenylalanine, tyrosine, tryptophan, serine, threonine, aspartic acid, glutami
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