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Fig. 2. Electron micrographs of Antarctic and mesophilic Cryptococci. Upper: Cryptococcus antarcticus. The large mitochondria were typical for this species; they may provide a respiratory advantage at the extremely low habitat temperature of this organism. Middle: Cryptococcus adeliensis. Lower: Cryptococcus laurentii. Bar, 1 µm. Mitochondria (m) and ER (arrows) are indicated.