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In vitro developmental stages of Echinococcus granulosus in monophasic and biphasic culture media: a invaginated protoscolex; b evaginated protoscolex; c excretory canals and bladder formation; d first proglottid formation; e second proglottid formation; f third or more proglottid formation; g protoscoleces developed into vesicles after in vitro culture for 6 weeks
