FlexPepDock ab initio: behavior without fragment files

Hi there,

I've noticed that the FlexPepDock ab initio protocol will run even if fragments aren't specified. It also appears during these runs that the peptide backbone is flexible, varying between samples.

When no fragments are specified, what does the FlexPepDock application do to ab initio model peptides exactly?

Is there a 'default' set of fragments?

Thank you!

Nathan