Modifiers matching receptor:

• intracellular,
• endogenous,
• peripheral,
• sensory,
• sensitive,
• active,
• articular,
• abstract,
• nuclear,
• external,
• diverse,
• traditional,
• anatomical,
• environmental,
• soluble,
• discrete,
• specialised,
• functional,
• suitable,
• specialized,
• steroidal,
• related,
• inhibitory,
• antigenic,
• organic,
• additional,
• local,
• cellular,
• complicated,
• distal,
• chemical,

Simple categories matching endogenous:

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