BioEFP - extending EFP to proteins
BioEFP is a scheme to split a macromolecule into fragments. Proteins can be split along C-Ca bonds, as shown below.

The model is described here.
Check out our tools and tutorials on how to
prepare a protein system for EFP protein-ligand calculations
prepare a protein system for QM/EFP calculations QM/EFP calculations using BioEFP and FlexEFP