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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