Planaria with excretory system (protonephridia) isolated on white background. Flatworm flame cell. Protonephridia of planaria and other flatworm premium vector by mariaflaya

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white vector element illustration isolated animal structure cell part biology system scheme anatomy diagram worm physiology schema morphology cilia urinary secretory excretory flatworm urinary system osmoregulation excretory system planaria protonephridium Nephridium protonephridia flame cell nephridia tube cell

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