1. Catalase definition is - a red crystalline enzyme that consists of a protein complex with hematin groups and catalyzes the decomposition of hydrogen peroxide into water and oxygen.

2. Beta-hematin crystals having an acicular shape, an average particle size of 0.6-1.2 μm, and characteristic main peaks (including any peak having a diffraction angle within ±0.2° of the main peaks) of the diffraction angle 2θ at 7.4°, 12.2°, 21.6°, and 24.1°in x-ray diffraction obtained by powder x-ray diffraction using Cu-Kα radiation.