| http://www.w3.org/ns/prov#value | - Apparatus for performing an in-vivo measurement of a substrate, enzyme, or other biochemical agent on the skin or mucous membranes of an accessible body surface of a patient comprising means for reacting at least one chemical with said substrate, enzyme or other biochemical agent on a predetermined area of the skin or mucous membranes of the patient to produce at least one reaction product, and me
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