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(a) A typical coronavirus “slippery site” 5′-UUUAAAC-3′, found in all TGEV strains. (b) A 16-nt deletion before the initiation codon “ATG”, found in strains attenuated H, H16, Miller M60, TS, and Virulent Purdue. (c) A 29-nt deletion before stop codon “TAA”, found in strains attenuated H, H16, Miller M60, TS, and Virulent Purdue
