Normal Sera are non-immune serum samples that contain the usual complement of serum proteins, including the various classes of immunoglobulins. Normal serum provides a sufficient quantity of endogenous proteins to saturate and block nonspecific binding sites on fixed samples or assay substrates. When used as an antibody diluent, the non-immune serum also supplies a native chemical environment for antibodies to function properly without adding foreign protein components. The normal serum is frequently used for blocking or saturating generalized binding interactions for immunodetection methods, especially those involving tissue samples such as immunohistochemistry (IHC).

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