Fig. 1From: Rescue and evaluation of a recombinant PRRSV expressing porcine Interleukin-4Schematic diagram of the recombinant plasmid (pBAC-CH-1R/pIL-4). The porcine IL-4 (pIL-4) gene was inserted between the N gene and the 3′-UTR of the attenuated PRRSV infectious clone (pBAC-CH-1R). It exhibited expression as a separate sub-genomic RNA with a copy of the transcription regulation sequence for ORF6 (TRS6)Back to article page