title: Surface features of small thymocytes of rat: a freeze-fracture and scanning electron microscope study.
abstract: The surface of small thymocytes of 6 day old rats has been examined by freeze-fracture and scanning electron microscopy. Various procedures were used to enrich the cell population and protect their surfaces. On the basis of morphological criteria, three types of small thymocytes: smooth thymocytes (79.5% of total cells), thymocytes characterized by the presence of ridge-like profiles (16.1%) and thymocytes displaying a moderate number of small microvilli (2.4%). From the results after stimulation with PHA and later separation, it is concluded that the first population corresponds to small cortical thymocytes, and the second to small medullary thymocytes.
mesh_terms: D000818:Animals; D002462:Cell Membrane / Q000648:ultrastructure; D002469:Cell Separation; D005614:Freeze Fracturing; D008855:Microscopy, Electron, Scanning; D008871:Microvilli / Q000648:ultrastructure; D051381:Rats; D013950:Thymus Gland / Q000166:cytology / Q000648:ultrastructure*