Step 1. Include a blocking step if the tissue of interest displays endogenous immunoglobulin.
Step 2. In this instance, mouse tissue will be labeled using primary antibodies raised in mouse. Pre-incubate tissue/cells with unconjugated Fab anti-Fc antibody to block endogenous immunoglobulin, in this example the Fab used is Goat Anti-Mouse IgG1, Fcγ fragment specific. Wash.
Step 3. Create FabuLight-primary antibody complexes. In this example, Mouse Anti-Antigen X is complexed with an Alexa Fluor® 488-conjugated Fabulight (Goat Anti-Mouse IgG1, Fcγ fragment specific (115-547-185)); and Mouse Anti-Antigen Y is complexed with Rhodamine Red-X-conjugated FabuLight (Goat Anti-Mouse, IgG1 Fcγ fragment specific (115-297-185)).
Step 4. This creates two antibody:FabuLight complexes specific for antigen X and Y.
Step 5. The least abundant target is incubated first with the Mouse Anti-Antigen X complexed with Alexa Fluor® 488-conjugated FabuLight (Goat AntiMouse IgG1, Fcγ fragment specific). Wash.
Step 6. The sample is then incubated with the Mouse Anti-Antigen Y (more abundant target) complexed with Rhodamine Red-X conjugated FabuLight (Goat Anti Mouse IgG1, Fcγ fragment specific). Wash.