Fusion glycoprotein (F) gene of NDV V4(Hr) strain was amplified by reverse transcriptase_polymerase chain reaction(RT_PCR)and cloned into the pGEM_T vector. The sequence of the cDNA was obtained by Sanger's sequencing technique with their amino acid sequence being deduced.The results indicated that F gene is 1662bp in length and has a single opening read frame, which code for a polypeptide of 553 amino acid. F glycoprotein has three highly hydrophobic domains. There are 12 Cysteine residues and 5 potential ...