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Archive image from page 72 of Cytology (1961). Cytology cytology00wils Year: 1961 The electron microscope studies published to date on the submicro- scopic structure of the cytoplasm are more or less in general agreement concerning the reality of the endoplasmic reticulum, but considerable r' Figure 3-24. Electron Micrograph of Portion of Cytoplasm of Rat Parenchymal Liver Cell. Note local differentiation of membrane elements of the endoplasmic reticulum into smooth- and rough-surfaced types. The smooth-surfaced elements (ss) appear as vesicles and tubules disposed in discontinuous groups
Archive image from page 72 of Cytology (1961). Cytology cytology00wils Year: 1961 The electron microscope studies published to date on the submicro- scopic structure of the cytoplasm are more or less in general agreement concerning the reality of the endoplasmic reticulum, but considerable r' Figure 3-24. Electron Micrograph of Portion of Cytoplasm of Rat Parenchymal Liver Cell. Note local differentiation of membrane elements of the endoplasmic reticulum into smooth- and rough-surfaced types. The smooth-surfaced elements (ss) appear as vesicles and tubules disposed in discontinuous groups mostly at the periphery of the cell. The rough-surfaced elements (rsj rso) are arranged more or less parallel to one another in large arrays. Profiles of rough-surfaced elements sectioned normal to their surface are marked as rsj, and oblique to their surface as rso. Points of continuity between the smooth- and rough-surfaced elements are indicated by arrows. Numerous mitochondria (m) are seen in the field. (From Palade, G. E., 1956. 'The Endoplasmic Reticulum,' J. Biophys. Biochem. CytoL, 2, Suppl., Fig. 3, Plate 33.) confusion still exists regarding terminology and interpretation of indi- vidual components of the system. For example, the cisternae are inter- preted by Porter and Palade as pairs of membranes arranged in parallel and connected at their ends. Sjostrand (1956), on the other hand, suggests that the cisternae actually represent a discontinuous series of STRUCTURE AND FUNCTION OF CYTOPLASMIC ORGANELLES / 53
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