21. It is not a structural protein found in a completed particle of the virus. 22. The VP24 and VP35 structural proteins of EBOV play a key role in this interference. 23. The left ORF encodes 4 non structural proteins ( NS1, NS2, NS3 and NS4 ). 24. Late genes are expressed from 140 min to 48 hours post-infection, producing all structural proteins . 25. The virus is 22 % RNA by weight, the other 78 % being structural proteins . 26. NS3 protease, on the other hand, is responsible for the cleavage of non-structural proteins downstream. 27. The late region encodes structural proteins L1 and L2. 28. NP1 is a small non-structural protein that could induce apoptosis in transfection of HeLa cells. 29. It is also used to manufacture structural proteins and useful to propagate the immune system. 30. HPIV genomes are about 15, 000 nucleotides in length and encode six key structural proteins .
