| http://www.w3.org/ns/prov#value | - ctive hosts. [0081] With regard to the medium for use in the culturing of the transformant obtained using a microorganism, such as Escherichia coli, yeast, or the like, as the host, either a natural medium or a synthetic medium can be used, so long as it contains materials which can be assimilated by the microorganism, such as carbon sources, nitrogen sources, inorganic salts, and the like, and ca
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