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Transmissible gastroenteritis virus strain AYU was isolated in Shanghai. The complete genome has a length of 28,582 bp and contains seven open reading frames. Sequence analysis suggested that Shanghai strain AYU and U.S. strain Purdue P115 are derived from a common ancestor, as they have 99.6% similarity at the nucleotide level.
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Hou et al. (2012) studied this question.
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