Protein Structure
Signal sequences are part of a protein that

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

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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
ability of cells to dissolve cellular matrix
All of these
metalloprotein levels

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