X‐RAY STUDIES ON CYTOCHROME C PEROXIDASE

An X‐ray crystallographic investigation of the enzyme cytochrome c peroxidase is in progress. This report describes experimental methods for the X‐ray diffraction work. The crystals of the enzyme are orthorhombic with cell dimensions a ‐ 108.0 Å , b – 77.8 Å, and c =51.4 Å. The space group is P2 1 2 1 2 1 . Projection data of the native enzyme have been recorded using Ni‐filtered and graphite‐monochromatized Cu K radiation. The ratio I...