In the framework of the European Union programme for sequencing the genome of Saccharomyces cerevisiue we have determined the nucleotide sequence of a region of 24 152 bp located on the left arm of chromosome XIV between the BNIl and the POL2 genes. The sequence was obtained by directed sequence analysis using a mixture of Ex0111 and primer walking strategies. Subsequent analysis revealed 13 open reading frames (ORFs) including four small ORFs completely internal to, or partly overlapping with, other ORFs. Five of these ORFs have been described previously (BNII, APLI, L YPI, PIKI, POL2) and thus 74.8% of the 24 152 bp were already present in the databases prior to this sequencing effort. Interestingly, all 13 identified ORFs are characterized by a low codon adaptation index (0,04422). In addition, this region of chromosome XIV shows an unusually high gene density with about 88% of coding DNA. This amounts to one gene per 2177 bp, which is significantly above the average gene length (about 1500 bp). For eight ORFs considerable homologies to 'Expressed Sequence Tags' derived from human cDNAs located in the XREF database could be identified.'The complete nucleotide sequence of the 24 152 bp segment has been deposited in the EMBL data library under the Accession Number X92494.