... volume occupied by mitochondria is significantly lower in hearts of the red-blooded notothenioid Notothenia coriiceps (18.18±0.69%) in comparison with those of the icefish Chaenocephalus aceratus (36.53±2.07%), which lacks both Hb and cardiac Mb. Mitochondrial densities are not different between hearts...

... that the lesion in Chaenocephalus aceratus Mb is a duplicated TATAAAA element that blocks transcription. This lesion is distinct from those of other icefish species that do not express cardiac Mb. The C. aceratus Mb gene is nearly identical to that of Chionodraco rastrospinosus , a closely related Mb-expressing...

... quantified ultrastructural features and enzymatic indices of metabolic capacity in cardiac muscle from Gobionotothen gibberifrons , which expresses both Hb and Mb, Chionodraco rastrospinosus , which lacks Hb but expresses Mb, and Chaenocephalus aceratus , which lacks both Hb and Mb. The most striking...