prov:value
| - Z is a bond or selected from ???H, ???CO2H, ???OH, ???NH2, ???NHR10, ???N(R10)2, ???SH, a phosphate, a nucleotide, a substituted nucleotide, a polynucleotide, a substituted polynucleotide, an ester, a cleavable linker, a solid support, a reactive linking group, and a label;
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