Our known is limited for IL-6 signal transduction pathway and corresponding signal molecule. The isolation of genes related to IL-6 is necessary for revealing mechanisms of IL-6 signal transduction and discovery of new signal transduction molecules. To clone genes related with IL-6, here we utilized cDNA-RDA and a unproved DD-PCR method to both detect and isolate cDNA fragments from differentially expressed genes from the IL-6 induced and uninduced U937 cells. By using cDNA-Representational Differences Anai...