Related by context. Frequent words. (Click for all words.) 66 oxygen atoms 61 organic molecules 60 silicates 60 hydrogen atoms 59 adsorbed 59 methyl 58 dimer 57 olivine 57 organic compounds 56 molecule 56 molecules 56 micelles 55 amino acids 55 iron oxides 55 deuterium 55 monomers 55 ceramide 55 hydrogen atom 54 glycine 54 oxidants 54 metal ions 54 isomers 54 amino 54 nuclei 54 β 53 cysteine 53 silicate 53 oligomers 53 carbon atom 53 ions 53 HD #b [002] 53 tyrosine 52 ascorbic acid 52 aqueous solution 52 atoms 52 oxidant 52 hydrophobic 52 phospholipids 52 ligands 51 ionized 51 X ray emission 51 riboflavin 51 hydroxy 51 superoxide 51 anisotropy 51 spectra 51 isotopic 51 interstellar medium 51 sulfate 50 functionalized 50 phenols 50 prebiotic 50 ejecta 50 cis 50 adsorption 50 reactants 50 soluble 50 glycoproteins 50 esters 50 polypeptide 50 naturally occurring 50 hydrolysis 50 membrane protein 50 synthase 50 chemically 49 abundances 49 calcite 49 oxalate 49 phospholipid 49 fluorine 49 oxidizing 49 proteases 49 chirality 49 magnetization 49 terrestrial planets 49 intracellular 49 fullerene 49 oxidation 49 water vapor 49 fluxes 49 rocky planets 49 histone 49 eukaryotic 49 retinoic acid 49 fermions 49 sulphate 49 titanium oxide 49 ligand 49 magnetosphere 49 Enceladus 49 ultraviolet radiation 48 keratinocytes 48 bioavailable 48 volatiles 48 reactive oxygen species 48 biologically active 48 oxidized 48 amino acid 48 neutrons 48 solubility 48 polysaccharide