Modifiers matching neurotransmitter:

• endogenous,
• hydrophilic,
• small,
• abstract,
• biogenic,
• key,
• inhibitory,
• important,
• chemical,
• common,
• secondary,
• proinflammatory,
• excitatory,
• stimulating,
• happy,

Simple categories matching proinflammatory:

• neurotransmitter,
• activity,
• cytokine,
• cell,
• property,
• compound,
• response,
• substance,
• molecule,
• agent,
• protein,
• leukocyte,
• peptide,