Science, Microbiology, Biology (General), QH301-705.5, QR1-502, Brain - metabolism, Peptide Fragments - chemistry, PrPC Proteins - chemistry, Matrix Metalloproteinases, Membrane-Associated - metabolism, Peptide Fragments - metabolism, Copper - metabolism, degradation, prion protein, fragment peptide, MMP-7, Cu2, MT3-MMP, MT1-MMP