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"I have used a wide variety of secondaries and Jackson ImmunoResearch has consistently been the best. The fluorophores are bright and stable and their selective (x reactivity removed) secondaries have always shown species specificity in multiple labeling."
Janet Duerr, Ohio University
Fab fragments can be used to block endogenous immunoglobulins on cells, tissue, or other surfaces, and to block the exposed immunoglobulins in multiple labeling experiments using primary antibodies from the same species.