Neuropeptide FF (NPFF) and gonadotropin-inhibitory hormone (GnIH) are thought to be paralogous. and a recent study has revealed that both NPFF and GnIH peptides can activate the GnIH receptor (GnIHR. also called NPFFR1) in the European sea bass (Dicentrarchus labrax). However. https://www.herbsdailyes.shop/product-category/proline-l-proline/