Regenerating epidermis of leg ulcers andnormal skin(x400)Control biopsy sample of regeneratinga epidermis stained forB1 integrinSamples from patients treated with rhEGFstained fo B1 integrin andKeratin 19 showing epidermal stem cellislandsNormal skin biopsy showing some B1ntegrin expression in basal cells, but nonespinous or granular layers