Hi, You can use 3DNA or NAB (Nucleic Acid Builder) or even try Coot and then use a file converter to mrc. Best, Debanu > On Dec 21, 2016, at 12:05 PM, Anindito Sen <[log in to unmask]> wrote: > > Dear All, > > I want to built a 3d model of DNA to be used to show the path of genome transfer in a tailed phage electron density map, during infection. > > It will be helpful if The model can be generated as an mrc file or of a similar file format. > > Any suggestions? > > Thanks > > Andy > > Sent from my iPhone