Related by context. Frequent words. (Click for all words.) 79 cell membrane 68 membrane 67 molecules 66 molecule 66 membranes 64 proteins 60 nerve cells 59 lipids 59 epithelial cells 59 microtubules 58 liposomes 58 cells 58 enzymes 57 capillaries 57 blood vessels 57 nanoparticles 56 enzyme 56 GI tract 55 intracellular 55 mitochondria 55 gastrointestinal tract 55 tumor cells 55 receptors 55 cytoskeleton 55 extracellular matrix 55 bloodstream 54 protein 54 nanoparticle 54 molecular 54 peptides 54 mammalian cells 54 nanocrystals 54 filaments 54 amino acid 54 axon 54 diseased cells 54 immune cells 53 electrons 53 cilia 53 pores 53 nerve fibers 53 neurotransmitter 53 ions 53 axons 53 vasculature 53 nanotubes 53 digestive tract 53 subunits 53 amino acids 52 ion channels 52 peptide 52 atoms 52 epithelial 52 tissues 52 microspheres 52 mucous membranes 52 hydrogen atoms 52 organic molecules 52 nanostructures 51 vesicles 51 reactive oxygen species 51 endothelial cells 51 particles 51 signaling pathway 51 carbon atoms 51 ligands 51 protease 51 myelin 51 biomolecules 51 receptor 51 neurotransmitters 51 outer layer 51 protein synthesis 51 metabolism 51 nanotube 51 glutathione 50 collagen 50 DNA strands 50 lipid 50 cancerous cells 50 cytoplasm 50 neurons 50 endothelium 50 yeast cells 50 nano scale 50 fibroblasts 50 nanoscale 50 muscle tissue 50 nucleic acids 50 enzymatic 50 C. elegans 50 signaling pathways 50 chromatin 50 phosphorylation 50 actin 50 epidermis 50 polymers 50 dermis 50 synapse 49 astrocytes 49 intestinal tract