Fig. 3From: A novel biotinylated nanobody-based blocking ELISA for the rapid and sensitive clinical detection of porcine epidemic diarrhea virusAlignment of the amino acid sequences of the selected Nb1, Nb2 and Nb3 nanobodies. The sequences are grouped according to the similitude of their CDRs. Dots (as‘.’) indicate residues that differ from those in Nb1. Boxes are used to indicate residues that differ from those in Nb2Back to article page