Modifiers matching stimulation:

• mechanical,
• sexual,
• regular,
• sensory,
• outside,
• intellectual,
• antigenic,
• sympathetic,
• auditory,
• aversive,
• active,
• intense,
• mental,
• chronic,
• environmental,
• light,
• electrical,
• external,
• internal,
• physical,
• noxious,
• emotional,

Simple categories matching antigenic:

• preparation,
• substrate,
• receptor,
• substance,
• peptide,
• material,
• property,
• macromolecule,
• compound,
• component,
• polymer,
• stimulation,
• carrier,
• constituent,
• molecule,
• protein,
• agent,