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

metabolism of homogentisic acid
hemoglobin synthesis
insufficient thyroid production
collagen synthesis

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Protein Structure
Metastasis involves

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

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Protein Structure
Cyclins are proteins that

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

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