Immunohistochemistry (IHC) is a technique that utilizes the principle of antibody-protein interaction to stain tissue sections for the detection and localization of specific protein expression. Immunohistochemistry antibodies are characterized by their strong specificity, high sensitivity, and precise localization capabilities. This technique is widely employed in various fields, including clinical diagnostics and drug development, providing scientists and medical professionals with a powerful tool to understand protein expression and distribution at the tissue level.