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According to the text, epinephrine, also known as adrenaline, is produced in the adrenal medulla in response to stress or danger. It acts as a 'fight or flight' hormone and works together with noradrenaline to prepare the body for emergency situations. Epinephrine is also responsible for glycogen breakdown and is produced in the human brain, as well as in some neurons in the central nervous system. Together with dopamine and norepinephrine, it belongs to a group of neurotransmitters called catecholamines.