Modifiers matching ligand:

• natural,
• bound,
• lipophilic,
• weak,
• hydrophobic,
• acidic,
• anionic,
• soft,
• hard,
• binding,
• exogenous,
• simple,
• psychoactive,
• synthetic,
• metal,
• potent,
• organic,
• environmental,
• important,
• psychedelic,
• charged,
• additional,
• nonmetal,
• small,
• external,
• atomic,
• inorganic,
• neutral,
• functional,
• axial,
• common,
• endogenous,
• biological,
• polar,
• base,
• nonsteroidal,
• ionic,
• extracellular,
• relevant,
• hydrophilic,
• complex,
• ancillary,
• cationic,
• physiological,
• physiologic,
• complementary,
• active,
• uncharged,
• strong,
• cellular,

Simple categories matching exogenous:

• substance,
• protein,
• agent,
• carcinogen,
• macromolecule,
• particle,
• substrate,
• event,
• compound,
• alteration,
• sterol,
• inducer,
• demand,
• pathogen,
• enzyme,
• change,
• glucocorticoid,
• variable,
• hormone,
• occurrence,
• antioxidant,
• acid,
• amine,
• antigen,
• polysaccharide,
• metal,
• material,
• control,
• steroid,
• phosphoprotein,
• cytokine,
• shock,
• cause,
• force,
• disturbance,
• activator,
• estrogen,
• asthma,
• drug,
• carbohydrate,
• toxin,
• hexose,
• protease,
• corticosteroid,
• authority,
• issue,
• input,
• amphetamine,
• catecholamine,
• opiate,
• ligand,
• factor,
• precursor,
• food,
• proteinase,
• sugar,
• toxicant,
• buffer,
• retrovirus,
• phenomenon,
• system,
• inhibitor,
• process,
• cofactor,
• contaminant,
• solute,
• opsonin,
• stimulus,
• signal,
• molecule,
• acceptor,
• condition,
• base,
• dna,
• stimulant,
• component,
• chemical,
• intoxicant,
• poison,
• source,
• development,