Related by context. Frequent words. (Click for all words.) 77 nerve cells 71 neurons 65 axons 65 neuron 64 nerve fibers 64 progenitor cells 62 fibroblasts 61 myelin 61 neuronal 60 tumor cells 60 proteins 60 skeletal muscle 60 cells 60 immune cells 60 astrocytes 59 photoreceptors 58 lymphocytes 58 mitochondria 58 axon 58 autophagy 57 neural stem cells 57 neurodegeneration 57 macrophages 57 signaling pathway 56 muscle fibers 56 dendritic cells 56 Neurons 56 messenger RNA 56 protein synthesis 56 monocytes 56 melanocytes 56 BDNF 56 reactive oxygen species 56 NK cells 56 islet cells 55 microtubules 55 endothelial cells 55 signaling pathways 55 diseased cells 55 neutrophils 55 intracellular 55 synapse 55 transgenic mice 55 mammalian cells 55 dendrites 55 muscle tissue 54 signaling molecules 54 inhibitory 54 epithelial cells 54 vasculature 54 mRNA 54 RNAs 54 cytokines 54 microRNAs 54 tissues 54 cilia 54 ES cells 54 cell membrane 53 malignant cells 53 stem cells 53 SIRT1 53 RNA molecules 53 bone marrow stem cells 53 leptin 53 dopamine 53 knockout mice 53 synapses 53 transcription factors 53 brainstem 53 pancreas 52 enzyme 52 neurodegenerative disease 52 synaptic 52 visual cortex 52 hair follicles 52 miRNAs 52 apoptosis 52 neural 52 cochlea 52 C. elegans 52 caspase 52 blood vessels 51 neurogenesis 51 yeast cells 51 testis 51 protein 51 enzymes 51 tissue 51 spinal cord 51 phenotype 51 glutamate 51 extracellular 51 cytoplasm 50 insulin producing 50 neurotransmitter 50 prions 50 overexpression 50 cytoskeleton 50 cerebellum 50 cytokine 50 estrogen receptor