After the second or third round of panning and transduction to E. coli TG1 cells, individual colonies were picked and the VHH expression was induced with 3 mM IPTG. Soluble VHHs, extracted from the periplasm, were tested for binding to the RVFV-Gnecto and SBV-Gchead antigens at 10-fold dilution as described below (ELISA). Individual VHHs were sequenced and aligned according to the IMGT system as described (Harmsen et al., 2000; Lefranc et al., 2003).
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