Modifiers matching activator:

• corrosive,
• physiological,
• harsh,
• metal,
• physical,
• polar,
• chemical,
• pathological,
• auxiliary,
• potent,
• endogenous,
• exogenous,
• artificial,
• natural,
• salt,
• single,
• cellular,
• toxic,
• thermal,
• neural,
• alkaline,
• physiologic,
• immune,
• acid,
• biological,
• individual,
• pharmacological,
• metabolic,

Simple categories matching exogenous:

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