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A representation of monoclonal antibodies binding to antigens on a cell surface. Anna Tanczos/Wellcome Images Before becoming a Covid-19 drug, each candidate was just a tiny fragment of someone’s immune system, part of a swarm of Y-shaped proteins unleashed to try to keep the coronavirus from invading more cells. If the person recovered, these antibodies might end up in a blood sample in a lab. Some proved more effective than others. Yet even as researchers pinpointed the best of the bunch as possible medications, they knew their power could wane: What worked against the coronavirus as it was last year could falter as the pathogen evolved.

South africaUnited statesUnited kingdomTyler starrNick cammackGlaxosmithkline covidEli lillyAndrew adamsFred hutchinson cancer research centerFred hutchinson cancer researchAmanda peppercornChristos kyratsousஒன்றுபட்டது மாநிலங்களில்ஒன்றுபட்டது கிஂக்டம்டைலர் நட்சத்திரம்நிக் கேமாக்