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The conformational changes required to transmit the GH binding signal from the extracellular domain of the GH receptor to its intracellular domain resulting in activation of JAK2 has been enigmatic. We have recently defined the first complete mechanistic model for JAK2 activation based on an archetypal cytokine receptor, the growth hormone receptor. To formulate this model we have used FRET to monitor...
Activated macrophage-conditioned medium (M-CM) induces megakaryocytic differentiation of HIMeg-1 cells. The megakaryocytic differentiation activity (MDA) is proteinaceous since it is susceptible to treatments by proteinases, heat, and reducing agents. MDA is not thrombopoietin (TPO) since (1) TPO alone or in conjunction with several other recombinant cytokines fails to induce any degree of HIMeg-1...
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