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Evolution of the distances between atoms involved in the hydrogen bonds that stabilize (A) the 3–10 helix in the complex NT4-TrkB: O Pro7-N Arg10 (black) and O Ala8-N Arg11 (gray), and (B) the α-helix in the complex NGF-TrkA: O Pro5-N Arg9 (black) and O Ile6-N Gly10 (gray).
