Media type: E-Article Title: Photo-activation of hypericin with low doses of light promotes apparent photo-resistance in human histiocytic lymphoma U937 cells Contributor: Paba, Valentina; Quarto, Maria; Varriale, Linda; Crescenzi, Elvira; Palumbo, Giuseppe imprint: Elsevier BV, 2001 Published in: Journal of Photochemistry and Photobiology B: Biology Language: English DOI: 10.1016/s1011-1344(01)00125-7 ISSN: 1011-1344 Keywords: Radiology, Nuclear Medicine and imaging ; Biophysics ; Radiological and Ultrasound Technology ; Radiation Origination: Footnote: