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Light microscopic images of P. bursaria and its ex-endosymbiotic algae. (A) Matured cell of P. bursaria harboring the symbiotic green algae. (B) Ex-symbiotic algae isolated from P. bursaria. (C) Alga-free apo-symbiotic host cell of P. bursaria. (D) Cyanobacteria (Synechocystis spp. PCC 6803).
