Dodecahedral crystals of chicken pepsinogen have been prepared, one perfect cystal having the dimensions 0.090mm × 0.086mm × 0.009mm. The derived pepsin crystallized in the form of flat plates, often with one rounded end. The dimensions of one such crystal wer 0.076mm × 0.043mm. Both types of protein crystals showed full enzymic or potential enzymic activity.

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