Protein Structure
Signal sequences are part of a protein that

refold proteins in prion-associated diseases
signal the protein synthesis on the ribosomes is ended
signal folding of the protein
transport proteins to other sites within the cell

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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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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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