41. :There is debate on whether viruses, especially retroviruses , are alive. 42. All complex retroviruses face the problem of exporting unspliced and partially spliced mRNAs. 43. An example of the first type is HIV, which is a retrovirus . 44. It includes Gag polyproteins from several avian endogenous retroviruses . 45. HIV is the first retrovirus identified as an important cause of disease in people. 46. Jaffe said in an interview at a meeting on human retroviruses and related infections. 47. Allan himself studies primate retroviruses that cause disease _ particularly AIDS _ in humans. 48. The data were presented Tuesday at the 6th Conference on Retroviruses and Opportunistic Infections. 49. Stapleton presented the latest discovery Thursday in Boston at the 10th Conference on Retroviruses . 50. Common starlings may contract avian tuberculosis, avian malaria and retrovirus -induced lymphomas.
