Modifiers matching ligand:

• natural,
• cationic,
• hard,
• bound,
• hydrophobic,
• polar,
• physiologic,
• biological,
• acidic,
• hydrophilic,
• nonsteroidal,
• exogenous,
• metal,
• psychoactive,
• physiological,
• nonmetal,
• psychedelic,
• neutral,
• complex,
• extracellular,
• simple,
• potent,
• complementary,
• base,
• anionic,
• atomic,
• cellular,
• small,
• axial,
• weak,
• lipophilic,
• organic,
• charged,
• common,
• active,
• endogenous,
• binding,
• uncharged,
• soft,
• inorganic,
• ionic,
• functional,
• relevant,
• external,
• additional,
• environmental,
• ancillary,
• important,
• strong,
• synthetic,

Simple categories matching cationic:

• agent,
• metal,
• drug,
• reactant,
• marker,
• current,
• antiseptic,
• polymer,
• anaesthetic,
• medication,
• ion,
• contaminant,
• ligand,
• material,
• substance,
• antibiotic,
• chemical,
• catalyst,
• system,
• anesthetic,
• mineral,
• lipid,
• component,
• compound,
• group,
• surfactant,
• salt,
• carrier,