Figure 4
From: Detection of non-reference porcine endogenous retrovirus loci in the Vietnamese native pig genome
Structure for detecting non-reference long terminal repeats (LTRs) in the U3 region. (a) Porcine endogenous retroviruses (PERV)-LTR structure. The PERV-LTRs were classified into types B and A according to the patterns of their repeat sequences at 18 bp and 21 bp. Type B LTRs were divided into the subtypes LTR B1, LTR B2, and LTR B3 based on the number of repeats in their sequences. Type A LTRs were divided into the subtypes LTR A1 and LTR A2. (b) Type B repeat sequences are shown in light and dark gray at the top of the figure. Type A repeat sequences are shown in dark gray and stripes at the bottom of the figure. Nucleotides are denoted in green (A), blue (C), purple (G), and red (T). From top to bottom, the labels at left show the LTR loci chr8_137488280, chr9_61533579, chr14_4896607, chr14_27599572, chr1_38667241, chr9_76895449, chrX_70665683, chr1_256173876, chr2_3400723, chr4_78524842, chrX_75151968, chr1_259647570, chr4_121221912, chr13_73434391, chr13_57502585, chrX_119479008, chr9_135717008, chr6_73460686, chr4_77324504, chr12_60076460, and chr13_60210737.
