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Structure of biotinylated abscisic acid (bio-ABA). (+)-Biotin-ɛ-aminocaproyl hydrazide (bio-ABA linker) was linked to the C′4 position of (±)2-cis,4-trans abscisic acid (ABA) and bio-ABA was then immobilized on streptavidin-coated magnetic beads for aptamer selection.
