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Variable structural organization of loop 3 Fn3 and interdomain linker in Pel3.A–C, organization of the loop 3 Fn3 observed respectively, in Pel32m (PDB 4U49) monomer A (A) and monomer B (B) and Pel31m (PDB 4U4B) (C). D–F, close-up view of the protein zones surrounded in A–C, respectively, showing crystal contacts with neighboring Pel3 monomers (in green) as well as phi and psi angles of residues Gln59, Ala60, and Gly61 forming a 310-helix of Pel3 loop 3.
