The SHP-2 protein participates in insulin signaling through its indirect activation by the insulin receptor (Fig. 13-31), a receptor tyrosine kinase. Yet SHP-2 is a protein tyrosine phosphatase. Is this a paradox? Explain.
In Figure 13.31

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Insulin Raf Ras Sos CAP IR Shc APS/Cbl pY TC1O pY pY 3 Gab-1 IRS proteins py SHP 2 PY PI3K Lipid rafts MEK SHR-2 py pY Fyn PDK1 MAPK MTORPKB/Akt РКСС PKca Jun Myc p9osk S6 kinase Fos AS160 S6 DNA/RNA/Protein synthesis Glycogen synthesis Glucose transport Cellular growth and differentiation Metabolism