Horseshoe Crab Biomedical Bleeding (IMAGE) University of New Hampshire Caption Students bleed a horseshoe crab to replicate the biomedical process used to procure Limulus amebocyte lysate (LAL), a product used to ensure vaccines are free of bacterial contamination. Credit Alexandria Sandry, Plymouth State University Usage Restrictions None 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.