Figure 2

Models of packaged DNA structure. a) T4 DNA is packed longitudinally to the head-tail axis [91], unlike the transverse packaging in T7 capsids [16](b). Other models shown include spiral fold (c), liquid-crystal (d), and icosahedral-bend (e). Both packaged T4 DNA ends are located in the portal [79]. For references and evidence bearing on packaged models see [19].