Mouse-on-Mouse Cross-Reactivity in Tissue Staining

Symptom

High background when using mouse primary antibodies on mouse tissue, caused by secondary antibody binding to endogenous mouse immunoglobulins and Fc receptors rather than only the primary antibody.

1. 1 Secondary antibody binding to endogenous mouse immunoglobulins in tissue
2. 2 Secondary antibody binding to mouse Fc receptors
3. 3 Cross-reactivity between anti-mouse secondary and tissue immunoglobulins
4. 4 Lack of specialized blocking for mouse-on-mouse applications

1. 1 Follow a Mouse-on-Mouse (MOM) staining protocol with specialized blocking reagents
2. 2 Use MOM blocking kit to prevent secondary antibody binding to endogenous mouse IgG
3. 3 Consider using primary antibodies from different species (e.g., rabbit anti-target)
4. 4 Implement Fc receptor blocking step before primary antibody incubation

Related Video (3)

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"Focuses on optimizing IHC staining quality and reducing background, directly relevant to troubleshooting the high background symptom"

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"CST IHC protocol video for paraffin-embedded tissue provides foundational technique context where this failure mode manifests"