Fig. 1
From: Convergent genomic signatures associated with vertebrate viviparity
The evolution of protein family size and reproductive mode in vertebrates. A Displayed here is a species tree topology that reflects the neutral phylogenetic model generated using fourfold degenerate sizes from 51 vertebrate species, with species names displayed as genera. B The number of sequences associated with the protein families ubiquitin fold N-terminal domain of silencing defective 2 (Ubi-N-Sde2) and the beta-sheet shell domain of vitellogenin (b-sheet-shell-Vtg) among viviparous and oviparous vertebrates