Modifiers matching buffer:

• inexpensive,
• nontoxic,
• volatile,
• natural,
• nonvolatile,
• organic,
• salt,
• ancillary,
• charged,
• endogenous,
• stable,
• acid,
• alkaline,
• common,
• inorganic,
• cellular,
• aromatic,
• exogenous,
• chemical,
• complex,
• acidic,
• basic,
• dilute,
• standard,
• mobile,
• gaseous,
• intracellular,
• urinary,
• minor,
• simple,
• appropriate,
• enzymatic,
• working,
• biological,
• physiological,
• active,

Simple categories matching endogenous:

• buffer,
• component,
• signal,
• compound,
• substance,
• damage,
• amine,
• estrogen,
• hormone,
• steroid,
• substrate,
• corticosteroid,
• cofactor,
• carbohydrate,
• ion,
• soporific,
• enzyme,
• sugar,
• catecholamine,
• nucleotide,
• fluid,
• polysaccharide,
• acid,
• vasopressor,
• chromophore,
• protein,
• sterol,
• pigment,
• control,
• chemical,
• neurotransmitter,
• virus,
• process,
• molecule,
• volatile,
• phosphatase,
• constituent,
• agent,
• activator,
• cation,
• lipoprotein,
• metal,
• contaminant,
• gene,
• androgen,
• reactant,
• monoamine,
• pathogen,
• change,
• macromolecule,
• receptor,
• protease,
• variable,
• ligand,
• cause,
• nucleoside,
• metabolite,
• opsonin,
• acceptor,
• solute,
• factor,
• corticoid,
• material,
• peptide,
• system,
• diamine,
• antigen,
• vasoconstrictor,
• lipid,
• proteinase,
• glucocorticoid,