Lacto-N-biosidase LnbX (IMAGE) Cell Press Caption This image shows the molecular structure of lacto-N-biosidase LnbX, an enzyme from a symbiotic bacteria (B. longum) in infants' gut to break down sugars in breast milk. Credit Yamada and Gotoh et al. 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.