Protein standards and controls are well-characterized proteins used to check that your assays are working right. You use them in ELISA, Western blot, or other detection assays to ensure size, concentration, or binding behavior is reliable. These proteins don’t always need to be bioactive, they just need known properties. It helps when batches match each other, and when purity is high. When you have good standards and controls, you spot errors early and trust your data more.
