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Structural homologues in FSSP ordered by DALI Z score (31). For most queries the heuristic cutoff, i.e., the first large gap from the bottom, ΔZ = Zi − Zi+1 > ɛ (vertical lines), separates the true remote homologs (black lines on the top) from all other proteins (gray lines on the bottom) according to SCOP classification (21).
