| http://www.w3.org/ns/prov#value | - A process for preparing a working seed solution of a vaccine containing as an active ingredient a mutant virus that is likely to generate revertants, which comprises the following steps (1) to (3):(1) Inoculating a solution of a mutant virus to 1 to n containers, wherein n is an integer, of animal cells and incubating them;(2) Diluting a portion of the cultured solution from each container and ino
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