improved resolution of the distribution of ict within individual cells allowed recognition of a ict-negative [ ict ( - ) ] early maturing cell , the primary ict-positive [ ict- ( + ) ] secretory cell with accumulation of ict within the basal and apical cytoplasm , an ict ( - ) cell that lacks a basal accumulation of secretory material , and a ict ( - ) cell that borders the central lumen .
C1327616
secretory
C0007634
cell