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Conserved hydrogen bond and salt bridge networks involved in stabilizing the N- and C-terminal regions. (A) Hydrogen bond networks Arg12-[Trp8, His/Asn15, Arg16, Asp187] and Asp187-[Arg12, Thr262]. The residues from PR1, VCP1 and Ver112 are colored blue, green and red, respectively. (B) An example of the salt bridge network Arg12:Asp187:Lyr18 in PR1. This salt bridge network also occurs in VCP1 and Ver112.
