5-Androstenediol, a steroid androgen which is an endogenous precursor for testosterone
It is an agonist of the opioid receptors, with evidence suggesting it serves as the endogenous ligand of the μ-opioid receptor, the same receptor to which the chemicals extracted from opium, such as morphine, have their analgesic and addictive effects (indeed, the μ-opioid receptor was named based on its most renowned ligand, morphine).
Finally, the exogenous technical progress of Harrod, and most writers on growth from whatever school in the 1960s and later, has been joined by numerous models which make technical progress endogenous in one of the several possible ways...
Dihydrotestosterone, a potent endogenous androgenic hormone, derived from testosterone
Unified growth theory was developed by Oded Galor and his co-authors to address the inability of endogenous growth theory to explain key empirical regularities in the growth processes of individual economies and the world economy as a whole.
Gunnar Heinsohn and Otto Steiger in their book "Eigentum, Zins und Geld" developed a theory called "Property Theory of Money", which also explains money by endogenous processes.
The agents of actinomycosis are now known to be endogenous organisms of the mucous membranes, in most cases Actinomyces israelii, a species named after surgeon James Israel, who first discovered its presence in humans in the late 1870s.
The post-Keynesian economist Steve Keen has recently developed models of endogenous economic crises based on Minsky's theories, but they are currently at the research stage and do not enjoy widespread use.
Hoffer and Humphry Osmond, who developed the hypothesis that schizophrenia is caused by the endogenous production of an epinephrine (adrenaline) based hallucinogen, were called before the Committee of Ethics of the American Psychiatric Association to explain why they were publicizing a treatment, called xenobiotic psychiatry by Bernard Rimland, which was considered outside of standard psychiatric practice.
Glutamate-cysteine ligase, catalytic (Gclc) and glutamate-cysteine ligase, modifier (GCLM) subunits form a heterodimer, which is the rate-limiting step in the synthesis of glutathione (GSH), a very powerful endogenous antioxidant.
Classical or serotonergic psychedelics (agonists for the LSD (also known as "acid"), psilocin (the active constituent of psilocybin mushrooms, commonly known as "magic mushrooms" or "shrooms"), mescaline (the active constituent of peyote), and DMT (the active constituent of ayahuasca and potentially an endogenous psychedelic compound).
Today this phenomenon is explained by the overexpression and accumulation of the endogenous lysosomal beta-galactosidase specifically in senescent cells.
The matrix metalloproteinases are inhibited by specific endogenous tissue inhibitors of metalloproteinases (TIMPs), which comprise a family of four protease inhibitors: TIMP1, TIMP2, TIMP3 and TIMP4.
Tobit model, an econometric model for censored endogenous variables proposed by James Tobin