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Information concerning the expression of thousands of genes , and also of different transcripts from the same gene , can be obtained in a single experiment , and the relationships among gene expression patterns can be studied systematically [ 4 ] . This initiative , led by the American Type Culture Collection ( ATCC ) and supported by most of the providers of hESC lines , represents a complementary effort that uses cell lines approved by the National Institutes of Health to develop a basis for comparison across different laboratories . Interviews were approved by the local authorities and the National Demobilization Committee of Somaliland . Since considering only the proteomically-identified interactions could lead to a strong underestimation of the positive results , as low affinity and purely functional interactions would be completely excluded , we decided to evaluate the predictive power of the three different methods respect to a less stringent functional index . For example , the expression profiles of tumors reflect the transgenic oncogene [ 5 ] ; moreover , those tumors induced by genes that activate the Ras signaling pathway ( for example , polyoma middle T antigen , ErbB2 / Neu , and H-Ras ) are more similar to each other than to tumors induced by components of the Wnt signaling pathway ( Wnt1 , β - catenin , and c-Myc ) with respect both to gene expression patterns ( [ 5 ] , S. Huang et al ., in preparation ) and to cellular composition and histology [ 6-9 ] . In addition , the presence of many tumor cells with myoepithelial features ( for example , expression of smooth muscle actin ) and other observations suggest that in the Wnt pathway oncogenes transform cells positioned early in the developmental program for mammary tissue , whereas oncogenes like ErbB2 / Neu that activate Ras proteins , either transform cells that are more advanced developmentally or drive cells to a more mature epithelial character during oncogenesis . Recent studies have shown that , if the expression of two or more genes is consistently related throughout many independent microarray datasets , the genes display a significant degree of functional similarity [ 7,8 ] . However , with the ability to rapidly assess expression of all human genes , it is possible to measure the expression of undifferentiated markers and any conceivable differentiation marker in a single step . SupplementaryReport.pdf is a PDFfile containing additional information on the statistical analysis of the expression data and the comparison with the cell - line data , as well as detailed descriptions of additional data files 2 and 3 . The clinical interview verified that in 83 % of positive screening cases psychotic symptoms were the most prominent manifestations of psychiatric illness . We used data from the Swedish infectious disease register and the national reference laboratory to describe phage type distribution of Salmonella Enteritidis infections in Swedish travellers from 1997 to 2002 , and have compared this with national studies conducted in the countries visited .