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Capsids form around the nucleic acid genome.
Capsids form first as empty structures, and then the genome is inserted. The final structure has fivefold, threefold, and twofold axes of symmetry. The capsomers are arranged in helical formation around the nucleic acid genome. Infection of E. coli cells with bacteriophage lambda can result in either a lytic or lysogenic cycle. During the lytic cycle a.