Protein Structure
Signal sequences are part of a protein that

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

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Protein Structure
Metastasis involves

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

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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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