Fusion gene amplification results by FA/FB and FA/FC primers; M= Molecular size marker; 1, 2 = NDV/Ck/Bogor/011; 3, 4= NDV/Ck/GnSindur/014; 5, 6= NDV/Ck/Cianjur/015; 7, 8 = NDV/Ck/Bogor/015; 1, 3, 5, 7 = Amplification by FA/FB primer; 2, 4, 6, 8 = Amplification by FA/FB primer.