Nanobodies against C. difficile TcdA and TcdB reveal unexpected neutralizing epitopes and provide a toolkit for toxin quantitation in vivo. - Kordus, Shannon L.; Kroh, Heather K.; Rodríguez, Rubén Cano; Shrem, Rebecca A.; Peritore-Galve, F. Christopher; Shupe, John A.; Wadzinski, Brian E.; Lacy, D. Borden; Spiller, Benjamin W. (PLoS Pathogens, 2023)