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The Crystallography Cryo Kit for Proteins provides a rapid, empirical, and efficient screening method to determine the solubility and optimal starting conditions for the crystallization of biological macromolecules in the presence of a cryoprotectant (primarily glycerol). The screening range and probing ability of the Cryo Kit are comparable to those of the Basic Kit. A cryoprotectant is added to freeze crystals in an amorphous glass at -173°C.

Based on known or published data from various proteins, the Cryo Kit uses a sparse matrix method and minimal amount of protein sample to explore a broad range of buffers, pH, and precipitants. The Protein Cryo Kit is based on the "salting out" principal: increasing the concentration of a precipitating reagent and cryoprotectant depletes the macromolecules of bound water and leads to their precipitation or crystallization.

The kit contains 50 components with 10 mL each. Most components can be ordered separately as 100 mL packages.