Related by context. Frequent words. (Click for all words.) 68 ions 62 cell membrane 62 endocytosis 62 extracellular 62 electrons 62 vesicle 61 metal ions 61 plasma membrane 60 intracellular 59 electron 59 vesicles 59 molecules 59 signaling molecules 58 oxygen atoms 58 nuclei 58 cAMP 58 heme 58 hydrogen atoms 57 photons 57 nanocrystals 57 membrane protein 56 leukocytes 56 outer membrane 56 neurotransmitter 56 atoms 56 membrane 56 liposome 56 cell membranes 56 glutamate 56 ion channels 55 neurotransmitters 55 microtubules 55 neutrophils 55 microcapsules 55 HSCs 55 molecule 55 liposomes 55 magnetic nanoparticles 55 epithelial cells 55 adsorbed 55 monocytes 55 chemical messengers 55 T lymphocytes 54 microparticles 54 monolayer 54 phospholipids 54 β 54 synapse 54 macrophages 54 neutrons 54 proteins 54 immune cells 54 glia 54 cysteine 54 nerve cells 54 neurones 54 reactive oxygen species 54 magnetosphere 54 capillaries 53 adsorption 53 actin 53 glial cells 53 acetylcholine 53 redox 53 neutrophil 53 nanoparticles 53 organelles 53 membranes 53 neurons 53 amino acids 53 magnetization 53 proton 53 subunits 52 integrin 52 ligands 52 lipids 52 astrocytes 52 macrophage 52 ferromagnetic 52 cytoplasmic 52 microspheres 52 extracellular matrix 52 cells 52 norepinephrine 52 fibroblasts 52 biochemical reactions 52 photon 52 particles 52 oligodendrocytes 52 adipocytes 52 pancreatic cells 52 naturally occurring protein 52 nanotubes 52 cytoplasm 52 vasopressin 52 cytokines 52 synaptic 52 hydrogen atom 52 calcium 51 oxidant 51 macromolecules