Orthology established by Iwasaki et al., 2013 (10 genes)

Orthology for ptger1a ( Chr: 6 )
Orthology for ptger1b ( Chr: 3 )
Orthology for ptger3 ( Chr: 6 )
Orthology for ptgfr ( Chr: 11 )
Orthology for tbxa2r ( Chr: 22 )