@Brian_BH What’s the rationale for 400368?
QID: 400368.
The question requires familiarity with the structure and charge of the given amino acid, specifically such that it contains the explicit knowledge that it is polar and charged, and the understanding of its suitability as a candidate for interaction with a phosphate group specifically, as compared to other answer options of amino acids that are either nonpolar, uncharged, or negatively charged, in order to avoid potential discriminator options listed as answer choices.
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