Paucity of X-linked genes with high expression bias toward testis. The testis::somatic tissue ratio of microarray signal intensities, observed between adult testis and a panel of somatic tissues , serves as a measure of testis bias of gene expression and is shown at bottom. Bars indicate proportion of genes up-regulated in testis development in the four bias categories. Orange bars, X-linked genes; blue bars, autosomal genes.
Mikhaylova and Nurminsky BMC Biology 2011 9:29 doi:10.1186/1741-7007-9-29