MEDICAL SCIENCES
PNAS is publishing an Editorial Expression of Concern regarding the following article: “Cell engineering with microfluidic squeezing preserves functionality of primary immune cells in vivo,” by Tia DiTommaso, Julie M. Cole, Luke Cassereau, Joshua A. Buggé, Jacquelyn L. Sikora Hanson, Devin T. Bridgen, Brittany D. Stokes, Scott M. Loughhead, Bruce A. Beutel, Jonathan B. Gilbert, Kathrin Nussbaum, Antonio Sorrentino, Janine Toggweiler, Tobias Schmidt, Gabor Gyuelveszi, Howard Bernstein, and Armon Sharei, which was first published October 31, 2018; 10.1073/pnas.1809671115 (Proc. Natl. Acad. Sci. U.S.A. 115, E10907–E10914). The editors express concern about the reproducibility of some of the results reported in Fig. 2D and Fig. 3 in this study. We will update readers as more information becomes available.
May R. Berenbaum
Editor-in-Chief