The slides were then counterstained with Haematoxylin (Cell-Path) for 2 min. and washed in running tap water. The slides were then de-hydrated in a graded series of ethanol (70%, 95%, 100%; 2 min. per incubation), cleared in Xylene (Fisher Biochemicals) and coverslips were mounted in Pertex (Cell-Path). Following staining the sections were photographed using a Leica Stereomicroscope at a 20 fold fold magnification.