Fig. 2From: An avian influenza A (H7N9) virus vaccine candidate based on the fusion protein of hemagglutinin globular head and Salmonella typhimurium flagellinSchematic for the construction of HA1-2-fliC. The cDNA sequence encoding residues 62–284 of avian influenza A (H7N9) virus HA1-2 was cloned for expression in E. coli. Meanwhile, the HA1-2 gene was further fused to the N-terminus of the fliC gene to form HA1-2-fliC by a linker of flexible peptide (Gly4Ser)3 Back to article page