these b-type cytochromes could also be resolved by difference absorption spectroscopy , which revealed one b-type cytochrome with absorption maximum ( alpha-peak ) at 558 nm , reducible by ascorbate-tetramethyl-p-phenylenediamine , and the other with absorption maximum ( alpha-peak ) at 560 nm , reducible by dithionite .
C0010798
cytochromes
C1256751
b-type cytochrome