Hi Andy, The "vop unbend" command can straighten the density from a curved filament. The tricky part is you need a center-line path. You could define that by placing 3 markers. http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/vop.html#unbend Bending a straight filament map to follow a curve is not available. This is the inverse of the vop unbend operation. You can do a fake version of this by making a helical curve around the straight density map and then using vop unbend. That won't center the filament on the helical path, but it will create something similar by straightening the helix which I think will twist the density. Tom

Hi Tom-

Not sure if there is an option for this -

1. can we bend an electron density map of a filament/tube by an small angle ?

2. Can we generate an helix using a density map of a filament. An example will be that of the bacterial flagella - it has the local helical arrangement of the flagellin molecule and then thAT ARRANGEMENT extends over several micrometers like a "sinusoidal wave" with different helical arrangement to the filament axis.

Best Andy

Dr. Anindito Sen (Ph.D)