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To fight the new white blood cells that were introduced during the transplant, Johnston’s blood is injected with Methoxsalen - a drug extracted from the Egyptian plant Ammi Majus, more commonly known as “Bishop’s weed.”

The new treatment combines the use of a drug called methoxsalen, which is extracted from the Egyptian plant, and an extraordinary high-intensity ultraviolet light.

First the dermatologists have the patient swallow methoxsalen pills.