electron microscopic examination of the plaque region revealed a crystalline structure ( repeat unit 380 to 410 a ) within rough endoplasmic reticulum of astrocytes , a paracrystal ( 160 to 220 a ) within the cytoplasm of astrocytes , and rigid tubules ( outer diameter 320 to 450 a ) within a cell in the lumen of a capillary .
C0230779
rough endoplasmic reticulum
C0010834
cytoplasm