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The procapsid shell. (A) Sections through a procapsid showing the invaginated five-fold vertices of the P1 shell. The diffuse densities are the minor procapsid proteins. (EMDB: 1501) [32] (B) The pentamer of P1 solved by X-ray crystallography. (PDB: 4K7H) [37] (C) Distinction of the P1A (blues) and P1B (red, orange, yellow) subunits in the procapsid. Scale bars: 100 Å.
