3-Pyridinemethanol is a useful synthetic intermediate.

Cytochrome C, a protein that belongs to class 1 of the c-type cytochrome family, exerts different functions depending on its cellular localization and the conditions in which it operates.

9-Aminoacridine is a highly fluorescent dye used clinically as a topical antiseptic and experimentally as a mutagen, an intracellular pH indicator.