Porteins, among the most complex of all organic compounds.
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A blood donor is a person who donates blood and a blood recipient is a person who receives donated blood.
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Spirogyra is a genus of green algae that belong to the order Zygnematales. These free-flowing, filamentous algae are characterized by ribbon-shaped chloroplasts that are arranged in a helical manner inside the cells. So the name is derived from the spiral arrangement of chloroplasts in these algae.
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