2011c-791 allergens chemicallyinduced congresses contact contactdermatitis dermatotoxicology diagnosis etiology guineapigs histologicaltechniques histology histopathology inflammation medicalprotocols occupational occupationaldermatitis pathological skin skinabsorption skindiseases skintests toxicity wr140 wr160h6732005 wr175c75861985 wr175m346c