EN
Determination of telomerase activity was performed with the use of telomerase PCR ELISA method in blood lymphocytes, dendritic cells, and cells isolated from lymphatic organs. Telomerase activity was detected in almost all investigated samples, but relative telomerase activity was on different levels. The highest activity of telomerase was determined in human tumour cell lines and FLK-BLV cells, but negative results were obtained in samples from healthy cows. The results of this study indicated that telomerase could be a useful marker for leukosis in cattle and various malignancies in other animals.