Modifiers matching antigen:

• active,
• foreign,
• exogenous,
• extrinsic,
• infectious,
• harmless,
• microbial,
• simple,
• environmental,
• single,
• noninfectious,
• extraneous,
• strong,
• indoor,
• internal,
• harmful,
• perennial,
• several,
• outdoor,
• diverse,
• oral,
• bacterial,
• endogenous,
• innocuous,
• soluble,
• free,
• possible,
• main,
• particulate,
• nutritional,
• dangerous,
• proteinaceous,
• small,
• peripheral,
• lethal,
• outside,
• viral,

Simple categories matching exogenous:

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