Sulfate incorporation by mouse synovial cells in vivo

Mouse synovium was examined autoradiographically at various postinjection to determine the pattern of 35S utilization. Synovial cells incorporated 35S in a manner consistent with synthesis and secretion of sulfated macromolecules. Ultrastructural examination demonstrated two cell populations, one with a structure indicative of phagocytic function, the other with a structure typical of secretory activity.