Fluorescein is a fluorophore widely used in biological analysis, with a pH dependent absorption and emission spectrum. In TBS LL-Fluorescein shows an absorption maximum at 494 nm and an emission maximum at 520 nm.
Glass vial(s) of Lightning-Link mix (1 or 3 vials, depending on pack size), 1 vial of LL-AP Modifier reagent, 1 vial of LL-AP Quencher reagent
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