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Fig. 5. Transmission electron micrographs of mitochondria within heart ventricular
tissue of red- and white-blooded Antarctic notothenioids. The mitochondria are
significantly smaller in hearts of (A) N. coriiceps (+Hb/+Mb)
compared with (B) C. aceratus (–Hb/–Mb). Micrographs of
ventricular tissue were taken at a final magnification of x75 700. Bar,
100 nm; Mit, mitochondria.