Category Nuances for porphyrin:

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

Simple Categories for porphyrin:

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