Fig. 4

Phylogenetic analysis of Y-linked genes. The phylogenetic trees of genes Metaloproteinase-Y (Panel a), Zinc finger-Y1 and Zinc finger-Y2 (Panel b), and Aconitase-Y (Panel c) are shown. The protein sequences were aligned with ClustalW, and a NJ tree with Poisson correction and complete deletion was constructed with the program MEGA. Bootstrap support values (10000 replicates) are shown inside the tree. We included all sequences returned by the TblastN search. Sequence accession numbers are shown directly in the phylogenetic trees (and can also be found in Table 1 and Additional file 5: Table S3)