| http://www.w3.org/ns/prov#value | - The term central metal ion as used herein includes biologically acceptable metal ions selected from alkali metals, such as sodium, potassium, lithium, and the like; alkaline earth metals, such as calcium, magnesium, barium, and the like; transition metals, including iron, copper, nickel, zinc, and the like; Group III metals including aluminum and the like, and lanthanide series metals.
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