although many of these epithelia showed morphologic features of normal stratified epithelia , several nonkeratinizing squamous metaplasias and acanthotic keratinizing squamous metaplasias exhibited some irregularities , probably representing very early atypical ultrastructural features ( ie , perinuclear concentration of tonofilament bundles , the presence of dark and clear basal epithelial cells , interruptions and alterations of the basal lamina ) .
C0014609
epithelia
C0596155
basal