 These N-terminally truncated peptides are known as the kisspeptins and belong to a larger family of peptides known as RFamides which all share a common arginine-phenylalanine-NH2 motif at their C-terminus.Among these conserved amino acids are arginine and phenylalanine residues, which are paired in this family of peptides.Also within this conserved family is a C-terminus that has an amide added to it.