PyMol has good tools for this via scripts people have made available. Simple arbitrary axis if you know where to draw it:
https://pymolwiki.org/index.php/Symmetry_Axis Crystallographic symmetry tools: https://pymolwiki.org/index.php/SuperSym Visualizing the transformation between two selections/objects - I suspect this is the one you want: https://pymolwiki.org/index.php/RotationAxis Brian Smith --------------- IUPAB & EBSA Congress 2017 16-20 July 2017 http://www.iupab2017.org/ Institute of Molecular, Cell and Systems Biology & School of Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK. ---------------
