脊髓灰质炎病毒 anyon RNA core P38 MPg VP4 P3C P3D 5′ non-coding 3 Protease Polymerase region VP1 P2A 1P2B1 P2C P3C AAAAA T 1,000 2,000 3.00 4000 5000 6000 7,000 Capsid proteins Non-structural proteins脊髓灰质炎病毒