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Once inside the body, the vaccine instructs human cells to build this protein, and the immune system learns to recognize and attack it. wide trowel However, DiSalvo said there's an "inherent tension" between the union leaders and environmentalists, and Biden is trying to court both. wide trowel The further along we go and getting more immunity, the stronger our messaging needs to be that it's time to start resuming normal life. wide trowel nbsp;Our men and women in uniform have been asked to sacrifice -- multiple tours, many of them -- for so long. wide trowel