the dark cells may constitute an active form , characterized mainly by the abundant free ribosomes , conspicuous rough endoplasmic reticulum , and golgi complexes , greater number of secretory granules ( sg ) and increased tortuosity of the plasma membranes as compared to the light ones which were considered as a less active type of cells .
C1179933
free ribosomes
C0230779
rough endoplasmic reticulum