Dear John,
In a hexagonal crystal class the possible point groups are
P3 (only a 3-fold axis)
P321(3-fold plus 2-fold relating hkl and kh-l)
P312 (3-fold and 2-fold relating (hkl and -k,-h,-l)
P6 ( 6 fold axis only)
P622 (6-fold plus 2-fold relating hkl and k,h,-l)
pointless will tell you which
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb] twinning in hexagonal system
Hello All,
This is regarding twinning in a data set.
I collected a native data set to resolution, 1.8 A. I used XDS suite
to process and scale the data set. It scaled well in P622 and I found
systematic absence (l=6n presen
Hello
Space groups with point groups 622 and 432 merohedral twinning is not possible
(they are the highest groups possible for proteins).
If you could merge in 622 it means that Rmerge was very small. It is very
likely that point group is either 622 or 6 with very strong rotational symmetry
th
Hello All,
This is regarding twinning in a data set.
I collected a native data set to resolution, 1.8 A. I used XDS suite
to process and scale the data set. It scaled well in P622 and I found
systematic absence (l=6n present).
Hence thought the space group may be P6122/P6522. SFCHECK did not
