Isn't a picture still worth a thousand words?

The transmission electron microscope is a valuable diagnostic and research tool that is presently underappreciated. In the area of human immunodeficie ncy virus research alone, it has provided critical information about viral pathogenesis and opportunistic infections and malignancies. However, becaus e it has not always been used with care, the literature contains misinterpr etations, especially as to what is a virus and what is actually a cell orga nelle, e.g., lysosome and Golgi vesicles. It is important to review the sub ject periodically to maintain its quality.