[Lys5,MeLeu9,Nle10]Neurokinin A(4-10) (LMN-NKA), an analogue of Neurokinin A, is a selective and potent NK2R agonist. [Lys5,MeLeu9,Nle10]Neurokinin A(4-10) has prokinetic activity. [Lys5,MeLeu9,Nle10]Neurokinin A(4-10) can be used to study the roles of the NK-2 receptor in smooth muscle contraction in numerous tissues [1] [2] [3] .