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Heterooctamer predicted by PISA for PDB entry 1d3u. The complex dissociates into two identical heterotetramers forming the right-hand and left-hand parts of the octamer. It is the tetramers, rather than the octamer, that are identified as the biological units in this case (Littlefield et al., 1999 ▶). See discussion in the text. The image was produced using the CCP4mg graphical viewer (Potterton et al., 2004 ▶).
