Models of packaged DNA structure. a) T4 DNA is packed longitudinally to the head-tail axis , unlike the transverse packaging in T7 capsids (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 . For references and evidence bearing on packaged models see .
Rao and Black Virology Journal 2010 7:356 doi:10.1186/1743-422X-7-356