Dear All, I am trying to build a molecular replacement model in arp/warp in space group P22121. Refmac alone seems to be fine with refining the model in P22121; but arp/warp fails, as far as I can see at the first Refmac refinement stage. In the log-file it says "this space group is not supported".
I am wondering whether arp/warp needs the Hermann-Mauguin convention space group P21212. I suppose I will need to reindex in P21212 in order to use arp/warp? (the diffraction data were indexed in XDS, scaled in SCALA, and then run through CAD to change the space group from P222 to P22121). I am using arp/warp via the ccp4i interface. Also, arp/warp gives the following message when I load the mtz file "cannot extract arp/warp asymmetric unit limits, the job will fail if run." (i did run arp/warp successfully with other mtz-files). Thank you in advance for any comments! Florian
