The second most common laser in a flow cytometer after the “blue” laser. The “red” laser typically has a wavelength of 633nm, but new flow cytometers are starting to use a “red” laser with a wavelength of 640nm. The most common fluorophores excited and detected off this laser are APC, Alexa Fluor 660, Alexa Fluor 700, and APC-tandems.
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