Alexa Fluor

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The Alexa Fluor family of fluorescent dyes is a series of dyes invented by Molecular Probes, now a part of Thermo Fisher Scientific, and sold under the Invitrogen brand name. Alexa Fluor dyes are frequently used as cell and tissue labels in fluorescence microscopy and cell biology.^[1] Alexa Fluor dyes can be conjugated directly to primary antibodies or to secondary antibodies to amplify signal and sensitivity^[2] or other biomolecules.^{[citation needed]}

The excitation and emission spectra of the Alexa Fluor series cover the visible spectrum and extend into the infrared.^[3] The individual members of the family are numbered according roughly to their excitation maxima in nanometers.