A. Phylogenetic analysis of differentially expressed MuERV U3 sequences. A phylogenetic tree of differentially expressed MuERV U3 sequences was established. The confidence values at the branch nodes represent the percentage support of a particular branching. Various colored shapes represent different lymphoid tissues. Sp (spleen), Th (thymus), aLN (axillary lymph node), iLN (inguinal lymph node), mLN (mesenteric lymph node). B. Multiple alignment analysis of differentially expressed MuERV U3 sequences. Differentially expressed MuERV U3 sequences were subjected to a multiple alignment analysis and yielded 22 unique U3 sequences. Yellow (100 % homology), white (low homology), blue (conserved sequences), and dash (absence of sequences). The locations of the direct repeats (1/1*, 4/4*, 5/5*, and 6/6*), unique regions (2 and 3), and TATA box are indicated in dotted boxes. An insertion of 190 bp is identified in the middle.