206L:
reference: Energetic cost and structural consequences of burying a hydroxyl group within the core of a protein determined from Ala-->Ser and Val-->Thr substitutions in T4 lysozyme., Blaber M, Lindstrom JD, Gassner N, Xu J, Heinz DW, Matthews BW, Biochemistry 1993 Oct 26;32(42):11363-73. PMID: 8218201

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