AIthough the 359 bp fragment probe spans the sequence encoding the proteolytic clea-vage site of the Fo protein,it could not differentiate the genome RNA of virulentstrain from the one of avirulent strain.

• 试验结果表明：尽管该探钎含有编码Fo蛋白酶切位点序列的碱基顺序,但它还是不能把NDV的强、弱毒株区分开。