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Expansion steps during node processing generate nodes with partially (e.g., VXXXX or AXXXX) and then fully (e.g., VFYWI) defined sequences. Once a node has a fully defined sequence, conformational trees are built for it for all states. Then conformational tree expansions lead to fully processed nodes. X, unassigned amino acid or RC; V, Val; A, Ala; F, Phe; Y, Tyr; W, Trp; I, Ile.
