mFluor Red 700 dyes are an excellent alternative to APC-Alexa Fluor 700 tandems since they have the spectral properties equivalent to those of APC-Alexa Fluor 700 conjugates. mFluor Red 700 dyes are water-soluble, and the protein conjugates prepared with mFluor Red 700 dyes are well excited at 633 nm to give red fluorescence (compatible with Cy5.5 filter). mFluor Red 700 dyes and conjugates are excellent red laser reagents for flow cytometry research. Compared to APC-Alexa Fluor 700 dyes, mFluor Red 700 dyes are much more photostable than the spectrally similar APC tandems, making them readily available for fluorescence imaging applications while it is very difficult to use a APC-Alexa Fluor 700 conjugates for fluorescence imaging applications due to the rapid photobleaching of the APC tandems (such as APC-Alexa Fluor 700).