Uptake and Intracellular Digestion of Ferritin in the Planarian Phagocata gracilis gracilis (Haldeman)

Abstract
Amphipods hypodermically injected with the iron-rich complex ferritin were fed to the planarian Phagocata gracilis gracilis (Haldeman). The Prussian blue staining technique permitted tracing digestion of the ferritin in the cytoplasm and vacuoles of the planarian gastodermis. Digestion was completed in about 48 hr. Observations suggest pinocytosis as a mechanism of uptake and concentration of the protein liquid prior to digestion.

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