[ccp4bb] 27.5% R/29% Rfree for 1.75A structure

[JINJIN ZHANG]

Hi All,
 
We have pretty much finished fitting and refining a protein-peptide complex structure, however, the 27.5% R/29% Rfree seem quite for a 1.75A resolution data. Does anybody have some idea about this kind of problem? Thank you.
 
Best,
Jinjin Zhang