“…Starkeya novella cytochrome c oxidase reacts rapidly not only with native cytochrome c but also with tuna and yeast cytochromes c, while it reacts very slowly with horse and cow cytochromes c (Yamanaka and Fukumori, 1977;Yamanaka and Fujii, 1980). Cytochromes c which react rapidly with the oxidase have Tyr (46), while cytochromes c which react slowly with the oxidase have Phe (46) (Yamanaka and Fukumori, 1978).…”