Thrombopoietin, known also as TSF (thrombopoiesis stimulating factor), for mediator substances that function as natural stimulators of megakaryocytopoiesis and thus, promote the differentiation of platelets. Thrombopoietin stimulates an increase in the sizes and numbers of megakaryocytes. It also increases the number of small acetyl-cholinesterase positive cells that are early precursor cells of the megakaryocytic lineage. Thrombopoietin is a protein of 332aa that shows significant homology with Epo (erythropoietin) in its N-terminal domain. A comparison of human and porcine Thrombopoietin sequences shows 83% identity between the erythropoietin-like domains but only 67% between the C-terminal domains.||Source:|Recombinant protein corresponding to mouse THPO expressed in E. coli.||Molecular Weight:|~19kD||Biological Activity:|The ED50 was determined by the dose-dependent proliferation of human MO7e cells was found to be ≤1ng/mL.||Endotoxin:|<1EU/ug (LAL)||Storage and Stability:|Lyophilized powder may be stored at -20°C. Reconstitute with sterile buffer or ddH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

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