The test of cell invasion suggested that P_(10) and L_(10) showedstronger adhesive ability and invasion ability to lungs and to lymph-nodes respectively. There were different ultrastructural characteristicsbetween P_(10) and L_(10).

• 细胞侵袭性试验表明P_(10)和L_(10)各自对肺和淋巴结粘附,侵袭增强,可很快侵入深部组织生长。