A quantitative assessment of protoporphyrin IX metabolism and phototoxicity in human skin following dose-controlled delivery of the prodrugs 5-aminolevulinic acid and 5-aminolevulinic acid-n-pentylester. - Gerscher,S.; Connelly,J.P.; Beijersbergen van Henegouwen,G.M.; MacRobert,A.J.; Watt,P.; Rhodes,L.E. (Br J Dermatol, 2001)