Localisation of sex-biased genes on the mouse X-chromosome. A: The female/male relative expression levels of all assayed transcripts on the mouse X-chromosome is shown for the six tissues included in the study. The heights of the bars indicate mean log2 female/male fold-change and the x-axis corresponds to spatial location on X (NCBI37/mm9 genome assembly). Orange bars indicate a fold-change beyond the given y-axis limit. Probe coverage (Affymetrix M430v2) and gene density (UCSC Browser, NCBI37/mm9, 10 Mb bins) is shown below. B: The distribution of transcripts with consistent female-bias (red) and male-bias (blue) in more than two tissues is shown. The heights of the bars indicate the number of tissues wherein the transcripts were sex-biased. The corresponding probes are listed in Table2. The green belt on the D-band marks the X-inactivation center.