Protein Structure
The four subunits of the hemoglobin (Hb) gene represent protein's

primary structure
quaternary structure
secondary structure
tertiary structure

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Protein Structure
Cyclins are proteins that

None of these
regulate passage from one stage of cell division to another
regulate apoptosis of damaged cells
regulate ability of cells to invade tissue

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Protein Structure
Metastasis involves

decreased levels of proteins that regulate metalloproteins
All of these
metalloprotein levels
ability of cells to dissolve cellular matrix

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