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OprB crystals growing in the cubic mesophase formed by 7.8 MAG. Precipitant conditions include 26 %(v/v) tri-ethylene glycol, 0.1 M ammonium sulphate, and 0.15 M glycine. Crystals appeared after 16 h and grew to a maximum size of 20 μm × 100 – 300 μm in 7 days. Images recorded with normal and with polarized light are shown in panels A and B, respectively. Other conditions are as described in Section 2.2.3 and in the legend to Figure 4.
