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26. You are trying to determine the sequence of a protein that you know is pure. However, The Sanger reagent (FDNB, fluorodinitrobenzene) identifies Ala and Leu as amino-terminal residues, in roughly equal amounts. Give the most likely explanation for the observation. You may use a simple diagram for your answer. 27. Name four factors (bonds or intermolecular forces) that contribute to stabilizing the native structure of a protein