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"We found that the M1 phenotype, anti-tumor microphage, seem to have trouble finding their targets, almost like their GPS wasn't working. But the M0 phenotype seemed to have a really good map."

A movie clip created by a fellow Barres postdoc, Axel Nimmerjahn, recorded through a sheer window in a mouse’s skull, hinted that microglia—which play the role of microphages in the brain—were responsible.

They carry not only instructions about eye color, height, nose shape, enzyme production, microphage resistance, but a story, too.