tisdale: --before the gig.nt, i pitched to francis that it was really time that we do something definitive for sickle cell disease. >> lapook: in the laboratory, dr. tisdale and his collaborators created a gene with the correct spelling. then, to get that gene into the patient, they used something with a frightening reputation: h.i.v., the virus that causes aids. it turns out, h.i.v. is especially good at transferring d.n.a. into cells. >> dr. tisdale: so this shows the process. >> lapook: here's how it works. the corrected gene, seen here in yellow, is inserted into the h.i.v. virus. then, bone marrow stem cells are taken from a patient with sickle cell anemia. in the laboratory, those cells are combined with the virus carrying that new d.n.a. >> dr. tisdale: this virus will then find its way to one of those cells and drop off a copy or two of the correctly-spelled gene. and then, these cells will go back to the patient. >> lapook: if the process works, the stem cells with the correct d.n.a. will start produci

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political commentators are researching the last of this present trunk's dramatic recovery means the tisdale's problems may end up causing more political questions for the democrats 1st because campaigning against an ailing opponent is never a good look or an easy option thus the biden campaign pulled all of their attack ads only to then find that the president had no intention or big oil to combat for a long 2nd because of dollars of brush with his own mortality had the effect of making the president more vulnerable and therefore more human his rapid recovery means that he now claims to have taken on the virus and overcome it thus the president has find no doubt inadvertently yet another way to dominate the political agenda in the space of a few days has gone from generally a judge loser in the presidential 2020 debate to self-proclaimed victor over quickly to to any of this turn the contest upside down and turn the underdog president into the favorite perhaps not but equally the many commentators who had all but written him off should reflect on the full impact of this october surprise to en