Figure 8
From: Looking for the bird Kiss: evolutionary scenario in sauropsids
Current status and proposed evolutionary history of kisspetin receptor ( KissR) genes among sarcopterygians. The names of the current representative species of each vertebrate group are given at the end of the final branches, together with the symbol of the KissR genes they possess. Due to incomplete bird genome sequencing in the putative region of KissR4, the possible existence of KissR4 in birds cannot be ruled out and is symbolised by a question mark.