There's no need to turn on the oven or grill — the acidity of the lemon and lime juice alters the proteins in the seafood, cooking it without heat. (dinnerwithjulie.com)
Thus, virtually every pharmaceutical on the market today is either a protein itself or a type of molecule that alters protein function. (wi.mit.edu)
The chemical helps alter the protein structure of hair strands so that they remain smooth and straight for months. (scientificamerican.com)