the estimate for the mean diameter of exocrine nuclei ( 6.4 +/- 0.1 micron ) was based on a spherical model , whereas the estimates for the diameters of the nonspherical ( and nonconvex ) nuclei of the duct ( 6.4 +/- 0.2 micron ) and endothelial ( 6.7 +/- 0.1 micron ) cells were calculated from the numerical density of the exocrine cells and the relative frequencies of the three cell types ( determined from serial reconstructions ) .
C0007610
nuclei
C0007634
cells