| http://www.w3.org/ns/prov#value | - the medically useful metal ion-binding domain is selected from one of the group consisting of Y1 !n, Y1 --(R2)--Y1 !n and Y1 --(R2)--Y2 !n in which n is a number between 1 and about 6 and Y1 and Y2 are amino acids comprising a sulfur, nitrogen or oxygen which is available for binding to metal ions or can be made available for binding to metal ions;
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