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“He tirelessly examined tens of thousands of stained tumor slides. Towers of stacked slideboxes teetered around him and occasionally came crashing down.”

• —Gary Jones, NCI

Olympus Compound Microscope

Potter was usually at his laboratory bench using this microscope. Shown are plasma cells with darkly stained nuclei. The clear spots next to the nucleus are perinuclear “hoffs” and are filled with newly synthesized protein, in this case, antibody.