Fig. 1

Developmental timeline and gene expression levels between mouse and human samples used in this study. A The relative timing of embryogenic stages from zygote to post-implantation differs across the two mammals, mouse and human. Samples taken from a pair of published datasets derived from mouse (gray) and human (orange) represent an overlapping series of early developmental stages [18, 23]. B The total fraction of annotated genes that are expressed in males (blue) and females (red) on the autosomes, X-, and Y-chromosomes, are displayed separately for mouse (left) and human (right) datasets