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Mean quantities of msp2 transcripts in low- and high-passage-infected horses through day 22 after infection. Note the similarity in emergence of transcripts between days 7 and 20, with a greater number of transcripts in high-passage- than in low-passage-infected horses. This reflects the disproportionate emergence of a few msp2 transcripts in high-passage- compared to low-passage-infected animals at day 13. Bars represent standard errors of the means.
