Fig. 2From: Genome assembly of the basket willow, Salix viminalis, reveals earliest stages of sex chromosome expansionAlignment between S. viminalis and S. purpurea SDR regions. One-to-one orthologous alignments between S. viminalis scaffolds and chromosome 15 of S. purpurea, with forward alignments drawn in blue and reverse alignments drawn in red. The SDR region of S. purpurea is delimited by the gray shaded area (10.7–15.3 Mb, from Zhou et al. [66]). S. viminalis scaffolds anchored to chromosome 15 of P. trichocarpa are highlighted in bold, those inferred to be part of the S. viminalis SDR are underlined, and scaffolds well anchored with several colinear markers on other chromosomes are marked with an asteriskBack to article page