physiological, neural, neuroanatomical, serotonergic, cholinergic, neuronal, noradrenaline, neurobiological, synaptic, neurophysiological, excitatory, biochemical, inhibitory, nociceptive, homeostatic, limbic, superior colliculus, neuropeptide, limbic system, norepinephrine, neuroendocrine, neuromuscular junction, autonomic nervous system, sensory neuron, parasympathetic nervous system, proinflammatory, inosine, hormonal, gene expression, metabolic, catecholamine, gamma aminobutyric acid, physiologic, molecular, adenosine, presynaptic, neurohormonal, subcellular, beta endorphin, cannabinoid, hypothalamic, cortical, neuroactive, adrenal cortex, somatosensory, hippocampal, glial, electroencephalographic, pharmacological, basal ganglia, astrocyte, posterior pituitary, trigeminal, emotional arousal, assortative mating, metabolic pathway, enkephalin, neocortical, proteolytic, neurite, sensorimotor, oligodendrocyte, antitumour, vasomotor, depolarizing, caudate, axonal, phenylethylamine, postsynaptic, proteoglycan, olfactory, nicotinic, npy, epigenetic, eicosanoid, prefrontal lobe, glial cell, sexual arousal, immunological, xenobiotic, phasic, adrenal medulla, maturational, cerebellar, sympathomimetic, maladaptive, thyrotropin, natriuretic, mechanistic, somatic, glucocorticoid, oxidative phosphorylation, vagus, mitogenic, efferent, cytokine, cognitive, anterior pituitary, subcortical, psychostimulant, mineralocorticoid, appetitive, neurophysiologic, electrophysiological, psychophysiological, electrophysiologic, biophysical, endocrinological, neuropharmacological, pharmacodynamic, biobehavioral, immunologic, neurohumoral, neuropsychological, psychobiological

endorphin, neurotransmitter

endorphin

organic compound