Ten DNA markers were localized in the human genome by a screening procedure against the radiation hybrid somatic cell panel (GeneBridge 4 RH Panel) using polymerase chain reaction (RH mapping method). DNA markers were developed to nucleotide sequences adjacent to NotI sites of human chromosome 3 (NotI-STS markers) and also to nucleotide sequences of human cDNA (EST markers). Three EST markers mapped (B10164, S16R and 18F5R) were localized in the human genome for the first time. Marker B10164 was found to be homologous to the nucleotide sequence of the BASP1 gene coding a major receptor protein. Markers S16R and 18F5R presumably tagged new genes, because no homologies were revealed among the nucleotide sequences presented in the databases. For four NotI-STS, more precise localization on human chromosome 3 was determined. On the basis of the data obtained, the NotI map may be integrated with other types of physical maps of human chromosome 3. RH mapping with a standard commercial panel of radiation hybrid somatic cells provided a chance to integrate the data obtained into international databases and existing integrated human chromosomal maps.