Regardless, these threats do not change our position: we cannot in good conscience accede to their request.
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It is not for lack of trying. In some cases, microbiologists have ditched the Petri dish altogether, using microfluidics for manipulating and growing cells. However, these approaches aren’t likely to be adopted at scale as they require less common, less practical, and more expensive devices. So, what about other growth media?
A protein reinforces the blood–brain barrier, which becomes leaky with age.