Orthology established by Xue et al., 2018 (7 genes)

Orthology for hrh1 ( Chr: 11 )
Orthology for slc6a1a ( Chr: 23 )
Orthology for slc6a1b ( Chr: 11 )
Orthology for syn2a ( Chr: 23 )
Orthology for syn2b ( Chr: 11 )
Orthology for vgll4a ( Chr: 23 )
Orthology for vgll4b ( Chr: 11 )