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Polyclonal antibodies (pAbs) are antibodies that are secreted by different B cell lineages within the body (whereas monoclonal antibodies come from a single cell lineage). They are a collection of immunoglobulin molecules that react against a specific antigen , each identifying a different epitope .
In contrast to polyclonal antibodies, which are mixtures of many different antibody molecules, the monoclonal antibodies produced by each hybridoma line are all chemically identical. The production of monoclonal antibodies was invented by César Milstein and Georges J. F. Köhler in 1975.
Originally all antibodies produced for immunostaining were polyclonal, i.e. raised by normal antibody reactions in animals such as horses or rabbits. Now, many are monoclonal, i.e. produced in tissue culture. Monoclonal antibodies that consist of only one type of antibody tend to provide greater antigen specificity, and also tend to be more ...
Scientists commonly use monoclonal antibodies and polyclonal antibodies, which are composed of synthetic peptides. During the manufacture of these antibodies, antigen specific antibodies are sequestered by attaching the antigenic peptide to an affinity column and allowing nonspecific antibody to simply pass through the column.
In immunostaining methods, an antibody is used to detect a specific protein epitope. These antibodies can be monoclonal or polyclonal. Detection of this first or primary antibody can be accomplished in multiple ways. The primary antibody can be directly labeled using an enzyme or fluorophore.
Immunohistochemistry can be performed on tissue that has been fixed and embedded in paraffin, but also cryopreservated (frozen) tissue.Based on the way the tissue is preserved, there are different steps to prepare the tissue for immunohistochemistry, but the general method includes proper fixation, antigen retrieval incubation with primary antibody, then incubation with secondary antibody.