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The tertiary structure prediction (a) and three conserved domains (b) of silkworm SP2 protein. (a) Coloring is defined by the dss rasmol script, to show predicted secondary structure (red: helix; yellow: strand; gray: other); (b) Three conservative structural domains of SP2: hemocyanin_N domain (amino acids 33–157), hemocyanin_M domain (amino acids 161–442), and hemocyanin_C domain (amino acids 446–680).
