Dear PyMol users!

I'm analysing polar interactions occured during MD simulation of my protein. In particular I have PDB file obtained from such trajectory where I'd like to check new polar contacts ( salt bridges first of all) within selection region. I've tried to select specified region and use Find polar contact- > within selection as well as other options from this context meny but results was blank and I have not seen any polar contacts despite some charged residues were presented in the adjacent interface positions in the selected region.

IS there any else way to study dynamics of the salt-bridges formation based on the selected regions in the snapshots ?

Thanks for help,