Abstract
Immunoblotting, also termed western blotting, is a powerful method for detection and characterization of proteins separated by various electrophoretic techniques. The combination of sodium dodecyl sulfate-poly acrylamide gel electrophoresis (SDS-PAGE), having high separating power, immunoblotting to synthetic membranes, and detection with highly specific peptide antibodies, is especially useful for studying individual proteins in relation to cellular processes, disease mechanisms, etc. Here, we describe a protocol for the sequential detection of various forms of an individual protein using peptide antibodies, exemplified by the characterization of antibody specificity for different forms of the protein calreticulin by double SDS-PAGE immunoblotting.
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