PRNP and Creutzfeldt Jacob disease: In the spinal cord of c-BSE and v-CJD primates, the apparent amount of total PrP was heterogeneous, intermediate between healthy and myelopathic primates, and significantly different from these two groups, with some of them also under the limit of detection (3/18 c-BSE and 5/15 v-CJD primates).