Protein Structure
Individuals with PKU disease are mentally retarded unless

phenylalanine in the diet is restricted
homogentisic acid in the diet is restricted
tyrosine in the diet is restricted
None of these

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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

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

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