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TEM documentation of fascicular thylakoid arrangement with prominent spherical formations (A–D), and the irregular arrangement (E,F). Fascicular and spherical formations in (A) Synechocystis sp. PCC 7509 and (B) C. thermalis PCC 7203. (C,D) Exclusively spherical formations in Arthrospira sp. PCC 8005. (E,F) Irregularly coiled thylakoids in Stigonema ocellatum SAG 48.90. Scale bars = 1 μm.
