Dr L tells me that the particular mutation I have is C-MPL W515L, not the K variant. The only recent paper on MPL mutations is from the journal Blood for July 1, 2008, see http://bit.ly/xV1wI3. This describes 44 patients with MPL mutations of all kinds, doubling the number reported to that date in peer-reviewed journals.
MPL, found at chromosome 1p34, encodes the thrombopoietin receptor that works in concert with thrombopoietin [http://bit.ly/xIsa7] for platelet production. Acquired MPL mutations eg, W515L and W515K are associated with severe anemia. [http://bit.ly/yN3G1w]