Protein Structure
Marfan's syndrome is thought to be a mutation affecting

collagen synthesis
metabolism of homogentisic acid
insufficient thyroid production
hemoglobin synthesis

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Protein Structure
Metastasis involves

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

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Protein Structure
Cyclins are proteins that

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

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