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Structure of the proviral genome of MuLV recombinants assayed in newborn mice. Mo-AmphoV differs from Mo-MuLV by a SalI–ClaI fragment encoding SUgp70. Recombinant Mo-AmphoV-MP is identical to Mo-AmphoV, except that the U3 region of the Mo-MuLV LTR has been replaced with that of MPSV (21). MES-AmphoV-MP differs from Mo-Ampho-MP in 354 bp of “leader” sequences immediately downstream of the 5′ LTR but upstream of the p65gag start codon derived from MESV (22).
