Scent Research (IMAGE) Ruhr-University Bochum Caption Hans Hatt's colleagues marked the cannabinoid receptor GPR18 using antibodies. Shown green in the image, that receptor is located in the centre of spermatozoa. Credit RUB, Marquard Usage Restrictions This image may only be used for reporting about the press release "Cannabinoid receptor activates spermatozoa" (August 30, 2016). License Licensed content 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.