Protein Structure
Signal sequences are part of a protein that

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

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Protein Structure
Cyclins are proteins that

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

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Protein Structure
Metastasis involves

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

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