Why, you might ask, do the medical mysteries of the Covid-19 pandemic sit at the center of a book on cell biology? Because cell biology sits at the center of the medical mysteries. Everything we understood about cells and their interactions with each other—how the innate immune system responds to a pathogen; how immune cells communicate with each other; how a virus, growing so tenaciously inside a lung cell, can cause a presymptomatic infection without alerting other cells around it; how the cells of the gastrointestinal system may act as first responders to a pathogen—has to be rethought and
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