[citation needed] The excitation and emission spectra of the Alexa Fluor series cover the visible spectrum and extend into the infrared.
[citation needed] A number of fluorescent dyes that are now widely used were discovered and developed in the laboratories of Molecular Probes.
were designed to improve upon properties of previously developed biological fluorescent dye families, and solve some of the issues that they possessed.
[citation needed] Molecular Probes was acquired in 2003 by Invitrogen,[4] who worked to further expand the Alexa Fluor family by the addition of new dyes to fill gaps not covered in the emission spectrum.
[citation needed] In 2014, Life Technologies was acquired by Thermo Fisher Scientific, who revitalized the Invitrogen name and brand, bringing the Alexa Fluor product line back under it.