Invisible: That’s what tumor cell clusters are

My oldest granddaughter turned three today! A recent memory involved climbing a wooden ladder, which was roped to a large, shady live oak tree, overlooking the passing cars in the “canyon” below. “They can’t see us, but we can see them.” She smiled with her great superpower of invisibility! Much of what I do relates to the invisible. After a surgery for cancer, we use all th...

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