Exogenous ς-aminolevulinic acid induces the porphyrin biosynthetics in human skin organ cultures with different porphyrin patters in normal and malignant human tissue. - Fritsch,C.; Batz,J.; Bolsen,K.; Schulte,K.W.; Ruzicka,T.; Goerz,G. (Proc SPIE, 1994)