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Diagram of Salmonella phage P22. The icosahedral head is formed by approximately 420 molecules gp5. The portal protein (gp1) 12-mer is inserted into one icosahedral facet. Up to six tailspike molecules (gp9) are attached to a slender neck structure formed by gp4, gp10 and gp26. This contact is mediated by the N-terminal, head-binding domain. Minor components (gp7, gp16 and gp20) are associated with the portal protein or the DNA.
