I have a question on immunostaining, about the step prior to primary Ab staining. By incubating the cells with a blocking agent such as normal serum derived from the same species as the secondary Ab, we can reduce non-specific staining (because the normal serum will coat the cell surface?), as I was told. My questions are:
1. If the normal serum can prevent the binding of the primary Ab to non-cognate proteins, will it not prevent its binding to cognate Ag as well?
2. Is the binding of primary Ab to non-cognate proteins on the cell surface not just as likely as its binding to non-cognate proteins in the normal serum, which is derived from a different species from the primary Ab?
Sorry if this question seemed trivial. Thanks in advance.
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Normal Serum as Blocking Agent
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