F12 (IMAGE) Thayer School of Engineering at Dartmouth Caption A molecular model of the F12 biotherapy shows the fold of its polypeptide backbone. Residual T cell epitopes are mapped onto the structure and colored from white (no epitopes) to dark red (dense overlapping epitopes). The muted red coloring indicates that T cell epitopes have been broadly silenced in the engineered F12 variant, and this reduced epitope content underlies the molecule's improved safety and efficacy profile. Credit Dartmouth Engineering 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.