Nitric Oxide Protects against Parasite Invasion (image) PLOS Share Print E-Mail Caption Enhanced invasion of Trypanosoma brucei (red) into the brain of iNOS deficient (lower micrograph) is compared to normal (upper micrrograph) mice. In green: cerebral blood vessels. Credit Olivera et al. Usage Restrictions All figures and photographic images will be published under a Creative Commons Attribution License (CCAL), which allows them to be freely used, distributed, and built upon as long as proper attribution is given. Share Print E-Mail 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.