In February 1954, Southam loaded a syringe with saline solution mixed with HeLa. He slid the needle into the forearm of a woman who’d recently been hospitalized for leukemia, then pushed the plunger, injecting about five million of Henrietta’s cells into her arm. Using a second needle, Southam tattooed a tiny speck of India ink next to the small bump that formed at the HeLa injection site. That way, he’d know where to look when he reexamined the woman days, weeks, and months later, to see if Henrietta’s cancer was growing on her arm. He repeated this process with about a dozen other cancer
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