Fig. 4From: Development of nanobody-horseradish peroxidase-based sandwich ELISA to detect Salmonella Enteritidis in milk and in vivo colonization in chickenConstruction of pCMV-N1-vHRP vector. The commercial vector pEGFP‑N1 changed into the vector to insert the main genes encoding IgG signal peptide, multiple cloning site, vHRP gene, HA and 7 × His flagBack to article page