Erythropoietin-dependent autocrine secretion of tumor necrosis factor-alpha in hematopoietic cells modulates proliferation via MAP kinase--ERK-1/2 and does not require tyrosine docking sites in the EPO receptor.
Chen J, Jacobs-Helber SM, Barber DL, Sawyer ST, Exp Cell Res, 2004 Aug 1 - link

A common epitope is shared by activated signal transducer and activator of transcription-5 (STAT5) and the phosphorylated erythropoietin receptor: implications for the docking model of STAT activation.
Barber DL, Beattie BK, Mason JM, Nguyen MH, Yoakim M, Neel BG, D'Andrea AD, Frank DA, Blood, 2001 Apr 15 - link