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In page Algae:
"These algae appeared independently in various distantly related lineages after acquiring a chloroplast derived from another eukaryotic alga. Two lineages of secondary algae, chlorarachniophytes and euglenophytes have "green" chloroplasts containing chlorophylls a and b.[1] Their chloroplasts are surrounded by four and three membranes, respectively, and were probably retained from ingested green algae.[citation needed]
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