A set of `Standard stereochemical dictionaries for protein structure refinement and model building' as described in John Priestle's article of that title in the recently-mailed CCP4/ESF-EACBM newsletter no. 29 is freely available -- not subject to the CCP4 licence -- for ftp from `ccp4.dl.ac.uk:pub/ccp4/priestle-dicts'. (Thanks, John.)