Figure 7

Histological section of the cheek after PDT. Light dose 100 J cm−2, drug dose 5 mg kg−1, DLI=30 min. (A) Tumour (Tu) with oedema, necrosis of the E, LP, striated muscle inner (SMI) and outer (SMO) layer, and CT (level 3). The tumour contains dead cells and is invaded by neutrophils. (B) Contralateral normal cheek pouch (level 1) The bar represents 400 μm.