Suppressing T Cell Function in Colitis (IMAGE) Boston Children's Hospital Caption In colitis, an infiltration of activated T cells (shown in red on the left) is clearly visible in the colon. By blocking the BH4 pathway (shown at right), the researchers were able to deeply suppress T cell function. Credit Woolf Lab/Boston Childrens Hospital/IMBA 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.