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Down syndrome (DS) is the most common human chromosomal abnormality caused by an extra copy of chromosome 21 and characterized by somatic anomalies and mental retardation. The phenotype of DS is thought to result from overexpression of genes encoded on chromosome 21. Although several studies reported mRNA levels of genes localized on chromosome 21, mRNA data cannot be simply extrapolated to protein...
The success of the Human Genome Project (HGP) enables prediction of proteins by computer programs from nucleic acid sequences and for which there is no experimental evidence. Clues for function of hypothetical proteins are provided by sequence similarity with proteins of known function in model organisms. The availability of this bulk of new data is of immediate importance to Down's syndrome (DS)...
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