Contraception study samples (IMAGE) Washington State University Caption A control sample of human semen (left) versus a sample treated with AEBSF to block semen liquefaction (right). Credit Washington State University Usage Restrictions For use only with stories associated with this press release License Original 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.