Expression levels of potential target genes in EHBDs after RRV challenge. One-way cluster analyses depict the changes in expression levels of mRNAs at 3, 7, and 14 days after RRV challenge relative to normal saline (NS) controls. Panel A shows a profile based on the differential expression at 7 days, while Panel B at 14 days. Each column represents expression levels from pooled samples of 2–6 EHBDs. RRV in red colored fonts indicate the time point used to select gene groups based on a significant level of expression in RRV group relative to NS controls.