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pho·to·phe·re·sis

n :  a method of treating disease (as certain lymphomas) esp. of T cell origin that involves pretreating blood in the living patient by administering a photoactive drug (as methoxalen), obtaining a fraction rich in white blood cells, exposing the fraction to damaging ultraviolet radiation, and returning it to the body where it stimulates a therapeutic immunological response .
 
 

 
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Jackson County Hospital District (Edna, Texas - Jackson County)