A crystal of the tetragonal modification of lysozyme grown under controlled conditions with in situ monitoring of the growth kinetics and morphology of the (110) face is studied by X-ray topography using synchrotron radiation. The choice of a diffraction reflection with optimal dispersion allows us to obtain an informative X-ray topographic image of the sample. It is found that the striations that are formed under changing supersaturation correspond to the type of zonality characteristic of crystals growing by the normal mechanism and differ from those observed in inorganic crystals growing by the layer-by-layer mechanism.
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