Multiplexing immunofluorescence allows researchers to stain a single sample with multiple primary antibodies originating from the same species, even if they have identical isotype. Staining can, e.g., be performed with multiple monoclonal mouse IgG1 kappa primary antibodies or with multiple polyclonal antibodies raised in rabbit at the same time.



NanoTag Biotechnologies offers a choice of secondary tools that are validated for multiplexing applications:

FluoTag-X2 anti-Mouse Immunoglobulin kappa Light Chain (Order no. N1202)

FluoTag-X2 anti-Mouse IgG1 (Order no. N2002)

FluoTag-X2 anti-Mouse IgG2a/b (Order no. N2702)

FluoTag-X2 anti-Rabbit IgG (Order no. N2402)


All secondary FluoTag-X2 reagents offered by NanoTag are based on monovalent single-domain antibodies (“nanobodies”) carrying two fluorophores each. They are supplied as solutions containing 5 µM nanobody (10 µM fluorophore). You can download a detailed protocol here.