Biogenic amines form when proteins putrefy. It used to be assumed that
the so-called putrefraction bases such as putrescine and cadaverine w
ere highly toxic. They were counted amongst the toxins arising from co
rpses - the ptomaines. More recent research has found however that put
rescine and cadaverine are relatively harmless and that the toxic subs
tances produced when protein putrefies are pure bacterial toxins. The
biogenic amines are not produced only from putrefying corpses, as used
to be believed, but occur primarily in many tissues of living organis
ms and have important functions to perform here.