Related by context. Frequent words. (Click for all words.) 87 neurons 78 nerve fibers 77 motor neurons 76 neuron 74 axons 72 neuronal 71 synapses 69 synapse 68 proteins 68 myelin 67 astrocytes 65 cells 65 neural 65 blood vessels 65 immune cells 64 synaptic 64 brain 63 acetylcholine 63 cortex 63 receptors 63 neurotransmitters 63 tumor cells 62 hair follicles 62 neurotransmitter 62 neural stem cells 62 dopamine 62 molecules 62 mitochondria 62 fibroblasts 62 glutamate 62 nerve endings 61 cell membrane 61 cilia 61 cerebellum 61 hippocampus 61 autophagy 61 molecule 60 inhibitory 60 cell membranes 60 protein synthesis 60 progenitor cells 60 enzyme 60 signaling pathway 59 signaling pathways 59 epithelial cells 59 cochlea 59 malignant cells 59 brainstem 59 mammalian cells 59 cortical 59 muscle fibers 59 yeast cells 59 intracellular 58 BDNF 58 enzymes 58 lymphocytes 58 skeletal muscle 58 muscle tissue 58 microtubules 58 endothelial cells 58 neurodegeneration 58 hypothalamus 57 electrical impulses 57 tissues 57 ion channels 57 plasticity 57 vesicles 57 dendritic cells 57 genes 56 amyloid plaques 56 receptor 56 C. elegans 56 macrophages 56 optic nerve 56 messenger RNA 56 mice 56 gene 56 cerebral cortex 56 transcription factors 56 stem cells 55 capillaries 55 lipids 55 molecular mechanisms 55 RNAs 55 microRNAs 55 serotonin 55 cancerous cells 55 spinal cord 55 norepinephrine 55 peptides 54 protein 54 amyloid beta 54 epidermis 54 retina 54 collagen 54 extracellular matrix 53 islet cells 53 cytokines 53 gene expression 53 macula 53 molecular