Substitution of conserved glycine residue by alanine in natural and synthetic neuropeptide ligands causes partial agonism at the stomoxytachykinin receptor4407, Poels, J, Van Loy T., Franssens V., Detheux M., Nachman R.J., Oonk H.B., Akerman K.E., Vassart G., Parmentier M., De Loof A., et al. , J.Neurochem., 0/7/2004, Volume 90, Issue 2, Number 478, p.472 - 478, (2004)