Immunohistochemistry · Pathology

Which step typically occurs immediately before antibody incubation in immunohistochemistry?

  1. Mounting sections with a glass coverslip
  2. Observation of sections under the microscope
  3. Counterstaining with hematoxylin
  4. Blocking nonspecific binding sites
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Correct answer: Blocking nonspecific binding sites

Blocking is performed before antibody incubation to prevent nonspecific binding of antibodies. This improves staining specificity and reduces background noise.

Difficulty: Medium Question 19 of 20

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