Category Nuances for porphyrin:

• organic,
• tested,
• acid,
• functional,
• cellular,
• important,
• larger,
• fluorescent,
• aromatic,
• conjugated,
• prosthetic,

Simple Categories for porphyrin:

• pigment,
• group,
• component,
• constituent,
• entity,
• system,
• particle,
• material,
• object,