Up-regulation of the protein tyrosine phosphatase SHP-1 in human breast cancer and correlation withGRB2 expression

Abstract excerpt

The protein tyrosine phosphatase SHP-1 is predominantly expressed in hemopoietic cell lineages, where its function is relatively well defined. However, its expression profile also extends to certain epithelial cell types. Furthermore, the negative regulatory role of this enzyme in hemopoietic cell signaling may not apply to other systems, where positive effects on particular tyrosine kinase signaling pathways...

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