| http://www.w3.org/ns/prov#value | - R1 is a functional group capable of reacting with the functions present on proteins, antibodies or on mineral or organic materials; X represents a single bond or a hydrocarbon-based chain consisting of at least one group chosen from alkylene groups and alkenylene groups optionally comprising at least one hetero atom, and from arylene groups; R2 is a group A2 that is anionic at neutral pH or an alk
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