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The proteins that normally serve as internal controls in your research may not always take center stage, but they are indispensable for conducting meaningful research, most notably for the proper interpretation of Western blots. Loading control proteins and protein tags provide a reference to evaluate the changes in expression levels of target proteins and help to ensure that any increase or decrease in target protein levels is due to your experimental manipulations, and not due to errors in the Western blot procedure. Proteintech tag and control antibodies are $99 each (€149 in Europe), including popular controls such as GAPDH, Tubulin and Actin.