N tau-methylhistamine is one of the histamine metabolites. N tau-methylhistamine in plasma and urine is a good parameter for histamine release and the determination of this histamine metabolite is generally less hampered by possible artifacts (due to basophil disrupture a very short half-life time or bacterial production) than determinations of histamine itself.

Furimazine is an imidazopyrazinone substrate. NanoLuc (Nluc) paired with Furimazine produced 2.5 million-fold brighter luminescence in mammalian cells relative to Oluc-19 with Coelenterazine.

Collagenase Type I is a proteolytic enzyme that breaks down the peptide bonds in collagen, the main structural protein of connective tissue.