PHOTOPROBE (Long Arm) Biotin for Nucleic Acid Labeling, 1 Kit. PHOTOPROBE Reagents are the nucleic acid labeling systems of choice for incorporating a label at multiple sites along the entire length of the nucleic acid. The nucleic acid labeling reaction does not destroy the original nucleic acid or create its copy. The integrity of the original sample is preserved. Single or double-stranded DNA, circular DNA, RNA, or PNA (peptide nucleic acid) can be labeled with the same reagents. Features: Labeling reagent has an extra long linker arm to increase the accessibility of the biotin, Kit labels up to 250 μg of target or up to 50 labeling reactions. Kit components: PHOTOPROBE (LA) Biotin Reagent, Tris Buffer, sec-Butanol, Precipitant, Biotinylated DNA Standard.