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The LC-MS chromatograms of: (A) the extract of Achyranthes bidentata Blum using 50% methanol; (B) the enriched peptides from Achyranthes bidentata Blum; (C) bidentatide after purification; (D) the linear sequence of bidentatide and its homologue, ziconotide (up), as well as their simulated 3D structures.
