Fluorescent conjugates of recombinant cholera toxin subunit B. Can be used for tract-tracing in neurological research, targeting GM1 ganglioside binding and retrograde transport. Biotium's CF® dyes have superior brightness and photostability compared to other dyes. • Blue fluorescent CF®405M dye has excitation/emission at 408/452 nm. • Green fluorescent CF®488A dye has excitation/emission at 490/515 nm. • Orange fluorescent CF®532 dye has excitation/emission at 527/558 nm. • Orange fluorescent CF®543 dye has excitation/emission at 541/560 nm. • Red fluorescent CF®568 dye has excitation/emission at 562/583 nm. • Deep-red fluorescent CF®594 dye has excitation/emission at 593/614 nm. • Far-red fluorescent CF®633 dye has excitation/emission at 630/650 nm. • Far-red fluorescent CF®640R dye has excitation/emission at 642/662 nm. • Far-red fluorescent CF®647 dye has excitation/emission at 650/665 nm. • Far-red fluorescent CF®660R dye has excitation/emission at 663/682 nm. • Far-red/near-IR fluorescent CF®680R dye has excitation/emission at 680/701 nm.