prov:value
| - Such alternatives are represented by Formula (III) where all variables are as previously described in Formula (1) and X4 is a reactive terminal group such as OH, NH. SH, halogen, e. g. , fluorine, chlorine, bromine, iodine, or other reactive groups known in the art, including, without limitation, aldehydes, hydrazines, carbazates, tosyl, mesyl, paranitrophenyl, N-hydroxysuccinimidyl, maleimidyl, e
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