Human thrombopoietin: gene structure, cDNA sequence, expression, and chromosomal localization - Foster, D C; Sprecher, C A; Grant, F J; Kramer, J M; Kuijper, J L; Holly, R D; Whitmore, T E; Heipel, M D; Bell, L A; Ching, A FT; McGrane, V; Hart, C; O’Hara, P J; Lok, S (Proc Natl Acad Sci USA, 1994)