History
Psoralens have been known since ancient Egypt but have only been available in a chemically synthesized form since the 1970s.
Read more about this topic: PUVA Therapy
Famous quotes containing the word history:
“The history of this country was made largely by people who wanted to be left alone. Those who could not thrive when left to themselves never felt at ease in America.”
—Eric Hoffer (1902–1983)
“It takes a great deal of history to produce a little literature.”
—Henry James (1843–1916)
“The history of a soldier’s wound beguiles the pain of it.”
—Laurence Sterne (1713–1768)