Numbering of residues is a nightmare! Peopel like to keep the
same numebring between species so that they can always refer to, say, SER
195. This leads to lots of things like 16A, etc for insertions. But
'16a' might be used by some authors for disordered residues - there is no
definitive convention. Also, some proteins are postprocessed - does '1'
refer to the chain before or after processing?
P.
Peter Murray-Rust, Glaxo Research & Dev. (pmr1716@ggr.co.uk); (BioMOO: PeterMR)
Birkbeck College, ubcg09q@cryst.bbk.ac.uk, CBMT/Daresbury mbglx@seqnet.dl.ac.uk
http://www.cryst.bbk.ac.uk/PPS/index.html, http://www.dl.ac.uk/CBMT/HOME.html