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(a) OxyHbII counterdiffusion behaviour in a 0.2 mm capillary. (b) The crystals grown from the GCB capillaries were extracted and equilibrated in 50 µl cryoprotectant solution. (c) A crystal of oxyHbII grown at pH 8.0, mounted on a nylon loop and flash-cooled in a 100 K liquid-nitrogen jetstream.
