Category Nuances for structural_protein:

• minor,
• relevant,
• biological,
• natural,
• polar,
• stable,
• critical,
• intracellular,
• endogenous,
• abundant,
• vital,
• cellular,
• soluble,

Simple Categories for structural_protein:

• material,
• polymer,
• molecule,
• constituent,
• protein,
• component,
• macromolecule,