| http://www.w3.org/ns/prov#value | - Modified nucleotides are provided which have the structure ##STR1## wherein R1 is a reactive group derivatizable with a detectable label, R2 is an optional linking moiety including an amide, thioether or disulfide linkage or a combination thereof, R3 is hydrogen, methyl, bromine, fluorine or iodine, R4 is hydrogen, an acid-sensitive, base-stable blocking group of an acyl capping group, R5 is hydro
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