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One-step growth curves of viable mutant and WT (MHV-A59 1000) viruses. (a) Viruses containing mutations in the upper (SL1-B and SL1-AB) and lower (SL1-C and SL1-D) portions of SL1 (see Table 1 for sequences). (b) Viruses recovered from infection with SL1-ΔA35 viruses.
