Fig 7. Phase contrast photomicrograph of MRC-5 human fibroblasts serving as a control uninoculated culture

Fig 8. Phase contrast photomicrograph of an MRC-5 human fibroblast culture showing evidence for cell destruction, with rounding and fusion of most of the remaining cells. The culture was inoculated with cellular material transferred from a primary culture of MRC-5 cells incubated with the patient's mononuclear cells.