Real lab failures, root causes, and fixes — curated and bilingually annotated by our team.
Diffuse background staining observed throughout tissue sections in IHC experiments, indicating inadequate blocking of non-specific antibody binding sites.
High background signal observed when using enzyme-conjugated antibodies (HRP or AP), caused by endogenous alkaline phosphatase or peroxidase activity in tissue generating false-positive results.
Excessive background staining when using amplification techniques or biotin-based detection, either from high signal amplification or endogenous biotin binding to streptavidin/avidin.
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.
Elevated background staining throughout tissue sections due to excessively high concentrations of primary or secondary antibodies leading to non-specific binding.
Increased background staining when primary antibody incubation is performed at room temperature, as higher temperatures promote non-specific antibody-tissue interactions.
Higher background staining concentrated at the edges of tissue sections compared to the center, indicating tissue dehydration during the staining procedure.
High fluorescent background signal when using formaldehyde-based fixatives (formalin/PFA) with fluorescent detection, particularly at green wavelengths where these fixatives naturally fluoresce.
Elevated background signal caused by residual fixative or unbound antibodies remaining on tissue sections between procedural steps, producing false-positive staining.
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