transcription, транскрипция: [ [SOR-uh-len] ]
A substance from plants that is sensitive to light (or can be activated by light). Psoralens are used together with UV light to treat psoriasis, vitiligo, and skin nodules of cutaneous T-cell lymphoma. They are also being studied in the treatment of graft-versus-host disease. They belong to the family of drugs called furocoumarins. An example of a psoralen is methoxsalen.