Dear Mark,
It does happen, even that two crystals from the same drop (everything identical) have different space groups.
Best,
Herman
-----Ursprüngliche Nachricht-----
Von: CCP4 bulletin board [mailto:[log in to unmask]] Im Auftrag von Markus Heckmann
Gesendet: Donnerstag, 9. November 2017 11:02
An: [log in to unmask]
Betreff: [EXTERNAL] [ccp4bb] double cell dimensions between P2 and C2
Dear all,
From a small protein, gives crystals P2 with cell
Cell 53.16 65.73 72.89 90 110.94 90
(has 3 molecules in the asymmetric unit). Tested with pointless. Does not give any other possibility.
Another crystal if the same protein, similar conditions:
C2
Cell 109.14 124.37 73.42 90 111.75 90. This has 6
molecules in the a.s.u. Tested with pointless. Does not give any other possibility.
The cell length a, b of C2 is twice that of P2.
Is it usual to get such crystals from similar conditions or am I missing something?
Many thanks,
Mark
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