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1D imino proton of the minimal mdPK constructs at 800 MHz and 10 °C. (A) mdPK-0. (B) mdPK. (C) mdPKΔA131. (D) mdPKA131U. The blue and cyan dashed lines connect imino resonances (62, 74) with different chemical shifts in different constructs. Sequence and secondary structures of each construct are shown at right. Secondary structure elements are colored as in Fig. 1.
