Locus-specific expression of ZNF280BY and ZNF280AY in testis. The alignment of read pairs derived from the deep sequencing of the selected cDNAs against unique coding regions of the ZNF280BY (A) and ZNF280AY (B) gene families. The left side Y-axis indicates the normalized number of read pairs, and the right side Y-axis indicates the identical copy number for a particular gene locus on BTAY. The blue columns indicate the perfectly matched read-pairs, while the yellow columns show the matched read-pairs with one nucleotide mismatch. The deep sequencing reads counting results are detailed in Additional file 3.