the proportion of principal cells in the epithelium was highest ( p less than 0.05 ) in the ccap ( 74 % ) and lowest in the ccor ( 68 % ) , whereas proportions of basal cells ( 25 % ) , apical cells ( 1.4 % ) , and white blood cells ( 2 % ) were similar in all regions .
C0014609
epithelium
C0596155
basal