Bacterial Fight (IMAGE) Penn State Caption Bacterial enterobactin (Ent), at right, inhibits the host antibacterial protein myeloperoxidase (MPO), which is present in white blood cells, at top left. In turn, white blood cells produce the protein Lipocalin 2 (Lcn2) that inhibits Ent and protects MPO, at bottom left. Credit Suraj Kumar Usage Restrictions Non commercial use only 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.