(Mag. 163 K). Modern control case NP196.08: ribosomes. On TEM examination of the brain that was optimally fixed for TEM at the time of autopsy (case 8), ribosomes of neurons were abundant, cell membranes and other cytoplasmic structures were intact. No particles similar to the VLP in the EL cases were observed in control brain either in the cytoplasm or in the nuclei. The contour of the ribosomes was irregular, in contrast with the images of the VLP in the EL cases, and their diameter was significantly less than the VLP illustrated in Figure 3. Bar = 100 nm.