Tears Graphical Abstract (IMAGE) Cell Press Caption This graphical abstract illustrates how a novel vomeronasal ligand, cystatin-related protein 1 (CRP1), from male rat tear fluid that mediates an intra-specific signal in a predator species (rat) can also function as an inter-specific signal in the prey species (mouse). Credit Tsunoda et al./Current Biology Usage Restrictions Credit Required 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.