Described in Retrovirus-mediated gene transfer and expression cloning: powerful tools in functional genomics. Exp Hematol. 2003 Nov;31(11):1007-14. Kitamura T, Koshino Y, Shibata F, Oki T, Nakajima H, Nosaka T, Kumagai H. Retroviral vector designed for expression cloning and efficient gene transfer. The pMX vector harbors 5 long terminal repeat (LTR) and the extended packaging signal derived from MFG followed by a multi-cloning site (MSC) suitable for cDNA library construction and 3 LTR of MMLV. The resulting vector pMX in combination with PLAT-E cells produces, on average, 1107 IU/mL of virus. For more information, please also see description for pMXs. migrattion note: viral:retroviral