Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
It has come to our attention that proper attribution was missing for one of the figures:
Figure 1 is a modified version of the topology of PKR2 receptor taken from Abreu AP, Kaiser UB, Latronico AC (2010) The role of prokineticins in the pathogenesis of hypogonadotropic hypogonadism. Neuroendocrinology 91:283–290.
The online version of the original article can be found under doi:10.1007/s00018-010-0601-6.
