Modifiers matching activator:

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

Simple categories matching exogenous:

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