Sexual Reproduction Hormones Needed for Puberty (image) University College London Share Print E-Mail Caption Neurons in the mouse brain expressing sexual reproduction hormones. Shown in green is gonadotropin releasing hormone (GnRH), which is needed to stimulate puberty. In red are the brain cells that are needed to release this hormone. People who lack these cells cannot undergo puberty and are infertile. Credit Professor Christiana Ruhrberg (UCL Institute of Ophthalmology) Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.