YR utilization at bin position +1 by PFV, MoMLV, PERV, and XMRV were on average increased by 63% relative to this value (Figure 1 G), equating to highly significant differences ( P values ranging from 5 x 10 −21 for PERV to >2.2 x 10 −308 for MoMLV; Additional file 2 : Figure S2A).
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