| http://www.w3.org/ns/prov#value | - The method of claim 1 wherein said medically useful metal ion-binding domain is selected from the group consisting of[Cys]n, [Cys-(R2)-Cys]n, [Cys-(R2)-Pen]n, [His-(R2)-Cys]n, [His-(R2)-Pen]n, [His]n and [His-(R2)-His]n wherein, n is a number between 1 and about 6; and R2 is an amino acid sequence containing from 1 to about 20 amino acids. 3.
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