Abstract
1. Experimental arthritis was induced in rats by the intradermal injection of modified Freund's adjuvant.
2. The granulation tissue occurring in and around the joints was examined with the electron microscope.
3. Intracellular collagen was demonstrated in many of the cells.
4. Collagen formation by these cells was studied by autoradiographic techniques using tritiated proline as a label.
5. The proline turnover was rapid, as most of the labelled proline had become extracellular one hour after its injection.
6. It was concluded that the collagen was present within the cells as a result of phagocytosis despite the fact that the cells had the electron microscopic features of fibroblasts.
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