the volumes of mitochondria , golgi zone and autophagosomes , as well as the surface areas of membranes of rough endoplasmic reticulum ( rer ) and of mitochondrial cristae and the numbers of ribosomes per unit volume cytoplasm were calculated . the results revealed 3 phases in erythroid maturation : ( 1 ) early and intermediate erythroblasts , ( 2 ) late erythroblasts , and ( 4 ) reticulocytes .
C0018042
golgi
C0010834
cytoplasm