Table 1.

The relaxin-2 gene in humans and great apes is the equivalent of the relaxin-1 gene in non-primate species and will be referred to as relaxin throughout this paper. Non-primate species only have RLN1 and RLN3 genes.

Humans and Great Apes	All other mammals e.g. mouse	Peptide abbreviation	Gene name
Relaxin-1	Relaxin#	RLX1	RLN1
Relaxin-2#		RLX2	RLN2
Relaxin-3	Relaxin-3	RLX3	RLN3

^#indicates functional equivalence