In an attempt to identify C/EBP-like transcription factors expressed in the prostate, a cDNA homologous to the mouse C/EBP delta (CRP3) and the rat CELF gene was isolated. A genomic clone containing the entire C/EBP delta gene was isolated using a cDNA fragment as a probe. The gene was characterized by restriction mapping and sequence analysis. By fluorescence in situ hybridization, using the biotinylated genomic clone as a probe, the C/EBP delta gene was assigned to the pericentromeric region of human chromosome 8, most probably to 8q11. This chromosomal localization was confirmed by analysis of a panel of human x hamster somatic cell hybrid DNA samples with a C/EBP delta-specific STS. As a result, the C/EBP delta gene could be positioned between the PLAT and the MOS loci.