Abstract: The hypervarieble minisatellite regions in human, animal and plant genome DNA can be detected by M13 bacteriophage as a probe.Its effective sequence was traced to two clusters of 15-base pair tandem repeats within the gene 3 of the bacteriophage. In this paper we utilized a unipue method of PCR to label M13 phage DNA and yielded a high specific activity. Human DNA digested with Hinfl was hybridized with labelled M13 and 33.15 probes. Highly polymorphic DNA fingerpriuts were obtained witb both of them. A practical casework was tested. (Original article on page 169)