Related by context. Frequent words. (Click for all words.) 67 circadian rhythms 64 circadian clock 62 circadian rhythm 62 circadian 61 metabolic processes 60 hormone melatonin 59 biochemical processes 57 pineal gland 57 reproductive hormones 56 biorhythms 56 homeostatic 56 neuronal activity 56 nerve impulses 55 autonomic nervous system 55 neurotransmitter serotonin 55 cell signaling pathway 55 metabolism 55 Notch signaling 54 cellular metabolism 54 oscillations 54 cellular pathways 54 Ghrelin 54 external stimuli 53 Physiologically 53 biological clocks 53 metabolic 53 NF kappaB 53 biochemical reactions 52 sensory nerves 52 neuroendocrine 52 leptin hormone 52 cell signaling pathways 52 neurochemistry 52 spermatogenesis 52 signaling pathways 52 neuropeptides 52 peripheral tissues 51 sensory inputs 51 chemical messengers 51 nematode worms 51 physiological mechanisms 51 hormone leptin 51 glutamate receptors 51 neural circuits 51 biochemical pathway 51 steroid hormones 51 mTOR pathway 51 synaptic plasticity 51 gut flora 51 naturally occurring hormone 50 sensory organs 50 neural mechanisms 50 parasympathetic 50 lipolysis 50 thyroid hormones 50 iNOS 50 muscle rigidity 50 EEGs 50 metabolic pathways 50 multicellular organisms 50 wakefulness 50 phagocytosis 50 skeletal muscles 50 sensory input 50 dopamine neurons 50 gut microbes 50 diurnal 49 embryogenesis 49 neurones 49 suppresses appetite 49 wakeful 49 mitochondrial function 49 physiologic 49 FGF# 49 muscle contractions 49 homeostasis 49 acetylation 49 Ca2 + 49 neural circuitry 49 Oxidative stress 49 synchrony 49 catabolic 49 hormonal 49 molecular pathways 48 telomerase activity 48 protein synthesis 48 sensory stimuli 48 oscillation 48 lipid metabolism 48 RANKL 48 Cortisol 48 electroencephalography EEG 48 L dopa 48 contractile 48 Wnt pathway 48 sensory neurons 48 catecholamines 48 cholesterol metabolism 48 endocannabinoid system 48 enzymatic activity 48 neurotransmitters