The complete genomic DNA sequence of human chromosome 22 has been determined, consisting of 12 contiguous segments spanning 33.4 megabases, containing at least 545 genes and 134 pseudogenes. This sequence provides the first view of the complex chromosomal landscapes in the human genome. The sequence was generated using a clone-by-clone approach, which allows for modular organization and efficient sequencing. The sequence covers the euchromatic portion of chromosome 22, which is the second smallest human autosome. The sequence was analyzed to identify genes, pseudogenes, and other genomic features. The sequence contains a variety of gene families, including immunoglobulin-related genes, glutathione S-transferases, and others. The sequence also includes regions with high repeat content, such as low-copy repeats (LCR22), which are important for gene organization and chromosomal stability. The sequence analysis revealed that the human genome contains a significant number of genes, with estimates suggesting at least 61,000 genes in the entire human genome. The sequence also showed that the distribution of genes is not uniform, with regions of high and low recombination. The sequence was compared to mouse genomic sequences to identify conserved synteny, revealing that human chromosome 22 is conserved with several mouse chromosomes. The sequence was made publicly available for further research, and the data release policy of the genome project continues to prioritize rapid and free access to genomic data. The sequence analysis also highlighted the importance of experimental data in gene annotation, as computational methods alone are not sufficient for accurate gene prediction. The sequence provides a valuable resource for understanding the structure and function of the human genome.The complete genomic DNA sequence of human chromosome 22 has been determined, consisting of 12 contiguous segments spanning 33.4 megabases, containing at least 545 genes and 134 pseudogenes. This sequence provides the first view of the complex chromosomal landscapes in the human genome. The sequence was generated using a clone-by-clone approach, which allows for modular organization and efficient sequencing. The sequence covers the euchromatic portion of chromosome 22, which is the second smallest human autosome. The sequence was analyzed to identify genes, pseudogenes, and other genomic features. The sequence contains a variety of gene families, including immunoglobulin-related genes, glutathione S-transferases, and others. The sequence also includes regions with high repeat content, such as low-copy repeats (LCR22), which are important for gene organization and chromosomal stability. The sequence analysis revealed that the human genome contains a significant number of genes, with estimates suggesting at least 61,000 genes in the entire human genome. The sequence also showed that the distribution of genes is not uniform, with regions of high and low recombination. The sequence was compared to mouse genomic sequences to identify conserved synteny, revealing that human chromosome 22 is conserved with several mouse chromosomes. The sequence was made publicly available for further research, and the data release policy of the genome project continues to prioritize rapid and free access to genomic data. The sequence analysis also highlighted the importance of experimental data in gene annotation, as computational methods alone are not sufficient for accurate gene prediction. The sequence provides a valuable resource for understanding the structure and function of the human genome.