41.   Only one company, BioPort of Lansing, Mich., is licensed to make anthrax vaccine.

42.   One proposal is to conduct a formal investigation into the missing information and how the vaccine was made.

43.   Researchers turned to DNA vaccines for AIDS only after years of trying to make traditional vaccines to elicit antibodies to the AIDS virus.

44.   Scientific papers published at the time did not say what primate tissues were used to make the vaccine, Hooper said.

45.   Scientists have tried to make such vaccines for decades, without success.

46.   Some newer vaccines are made from tiny portions of a virus, using genetic engineering techniques.

47.   Standard vaccines are made from killed virus.

48.   That has left only Aventis Pasteur making tetanus vaccine in the United States.

49.   That has enabled Cuba to make new vaccines for its comprehensive immunization program, which is widely admired by scientists and physicians.

50.   The BioPort Corp. of Lansing, Mich., is making the vaccine for the Department of Defense, which wants to vaccinate all soldiers.