in related tests in which the localization of enzyme activity was restricted to areas of the cell where there had been accumulations of naturally-occuring ( endogenous ) esters , the products of ester hydrolysis were restricted to profiles of endoplasmic reticulum associated with lipid droplets , and with the interior of about 20 % of those mbs that appeared completely circular in sections .
C0007634
cell
C0230704
lipid droplets