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In case of a crystal with an unknown space group (SPACE_GROUP_NUMBER=0 in [[XDS.INP]]), XDS (since [http://www.mpimf-heidelberg.mpg.de/~kabsch/xds/html_doc/Release_Notes.html version June 2008]) helps the user in determination of the correct space group, by suggesting possible space groups compatible with the lattice symmetry of the data, and by calculating the R<sub>meas</sub> for these space groups.
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== The 65 space groups in which proteins composed of L-amino acids can crystallize ==
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The mapping of numbers and names is:
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****** LATTICE SYMMETRY IMPLICATED BY SPACE GROUP SYMMETRY ******
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BRAVAIS-          POSSIBLE SPACE-GROUPS FOR PROTEIN CRYSTALS
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  TYPE                    [SPACE GROUP NUMBER,SYMBOL]
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  aP      [1,P1]
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  mP      [3,P2] [4,P2(1)]
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mC,mI    [5,C2]
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  oP      [16,P222] [17,P222(1)] [18,P2(1)2(1)2] [19,P2(1)2(1)2(1)]
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  oC      [21,C222] [20,C222(1)]
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  oF      [22,F222]
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  oI      [23,I222] [24,I2(1)2(1)2(1)]
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  tP      [75,P4] [76,P4(1)] [77,P4(2)] [78,P4(3)] [89,P422] [90,P42(1)2]
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          [91,P4(1)22] [92,P4(1)2(1)2] [93,P4(2)22] [94,P4(2)2(1)2]
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          [95,P4(3)22] [96,P4(3)2(1)2]
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  tI      [79,I4] [80,I4(1)] [97,I422] [98,I4(1)22]
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  hP      [143,P3] [144,P3(1)] [145,P3(2)] [149,P312] [150,P321] [151,P3(1)12]
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          [152,P3(1)21] [153,P3(2)12] [154,P3(2)21] [168,P6] [169,P6(1)]
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          [170,P6(5)] [171,P6(2)] [172,P6(4)] [173,P6(3)] [177,P622]
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          [178,P6(1)22] [179,P6(5)22] [180,P6(2)22] [181,P6(4)22] [182,P6(3)22]
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  hR      [146,R3] [155,R32]
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  cP      [195,P23] [198,P2(1)3] [207,P432] [208,P4(2)32] [212,P4(3)32]
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          [213,P4(1)32]
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  cF      [196,F23] [209,F432] [210,F4(1)32]
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  cI      [197,I23] [199,I2(1)3] [211,I432] [214,I4(1)32]
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== Space group selected by XDS: ambiguous with respect to enantiomorph and screw axes ==
 
== Space group selected by XDS: ambiguous with respect to enantiomorph and screw axes ==
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In case of a crystal with an unknown space group (SPACE_GROUP_NUMBER=0 in [[XDS.INP]]), XDS (since [http://www.mpimf-heidelberg.mpg.de/~kabsch/xds/html_doc/Release_Notes.html version June 2008]) helps the user in determination of the correct space group, by suggesting possible space groups compatible with the lattice symmetry of the data, and by calculating the R<sub>meas</sub> for these space groups.
    
XDS (or rather, the CORRECT step) makes an attempt to pick the correct space group automatically: it chooses that space group which has the highest symmetry (thus yielding the lowest number of unique reflections) and still a tolerable R<sub>meas</sub> compared to the R<sub>meas</sub> the data have in any space group (which is most likely a low-symmetry space group - often P1).
 
XDS (or rather, the CORRECT step) makes an attempt to pick the correct space group automatically: it chooses that space group which has the highest symmetry (thus yielding the lowest number of unique reflections) and still a tolerable R<sub>meas</sub> compared to the R<sub>meas</sub> the data have in any space group (which is most likely a low-symmetry space group - often P1).
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In many cases the automatic choice is the correct one, and re-running the CORRECT step is then not necessary. However, neither the correct enantiomorph nor screw axes (see below) are determined automatically by XDS.
 
In many cases the automatic choice is the correct one, and re-running the CORRECT step is then not necessary. However, neither the correct enantiomorph nor screw axes (see below) are determined automatically by XDS.
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== Table of space groups to consider based on CORRECT suggestion ==
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=== Space groups to consider based on CORRECT suggestion ===
 
{| cellpadding="10" cellspacing="0" border="1"
 
{| cellpadding="10" cellspacing="0" border="1"
 
! If CORRECT suggests
 
! If CORRECT suggests
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|}
 
|}
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'''Attention''': this table was set up on February 15, 2015 and has been not verified by anyone.
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'''Attention''': this table was set up on February 15, 2015 and has been not verified by anyone. If you find an error ''please'' send an email to kay dot diederichs at uni-konstanz.de !
    
== Space group selected by user ==
 
== Space group selected by user ==
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