A production method for a crystal of a crystalline protein, the method including a step of inducing expression of a crystalline protein in Escherichia coli into which an expression construct of the crystalline protein has been introduced, and incubating the Escherichia coli for a predetermined time until a crystal of the crystalline protein is formed inside the Escherichia coli, and a crystal structure analysis method including a step of subjecting a crystal produced by the above-described production method to an X-ray crystal structure analysis together with the Escherichia coli, are useful as technologies for conveniently producing and analyzing a crystal of a protein.

The present invention relates to compositions and methods for preparing cells from avian embryos. The invention also relates to cultures of such cells and the uses thereof, particularly for producing viruses such as MDV. The invention also relates to methods for the preparation of vaccines using such cells or viruses.