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A molecular cousin of DNA, mRNA contains instructions to build specific proteins; in this case, the mRNA in the vaccine codes for the coronavirus spike protein, a structure that sticks off the virus's surface and is used to infect human cells. chicago bulls jacket nike The story offers a useful way to view Joe Biden’s calls for national unity. chicago bulls jacket nike nbsp;Asked if Biden thought schools that were already open were being unsafe, Psaki said: "One of the challenges we have is that the data is not great – as it relates to schools that are open or not open, how hybrid learning is impacting kids. chicago bulls jacket nike 2 phone call with Georgia Secretary of State Brad Raffensperger where he urged the election official to "find" enough votes to overturn Biden's win in the state -- and appeared to issue subtle threats if Raffensperger failed to do so. chicago bulls jacket nike