rding to Formula I below: [0032] wherein P=phosphate (PO3) and derivatives thereof, n is 2 or greater; Y is an oxygen or sulfur atom; B is a nitrogen-containing heterocyclic base; S is an acyclic moiety, carbocyclic moiety or sugar moiety; P-L is a phosphorylated label with a linker between L and P, [0033] wherein L is a label containing a hydroxyl group, a sulfhydryl group, a haloalkyl group or a