RT Journal Article SR Electronic T1 Square beams for optimal tiling in TEM JF bioRxiv FD Cold Spring Harbor Laboratory SP 2023.07.29.551095 DO 10.1101/2023.07.29.551095 A1 Chua, Eugene YD A1 Alink, Lambertus M A1 Kopylov, Mykhailo A1 Johnston, Jake A1 Eisenstein, Fabian A1 de Marco, Alex YR 2023 UL http://biorxiv.org/content/early/2023/10/09/2023.07.29.551095.abstract AB Imaging large fields of view at a high magnification requires tiling. Transmission electron microscopes typically have round beam profiles; therefore, tiling across a large area is either imperfect or results in uneven exposures, a problem on dose-sensitive samples. Here, we introduce a square electron beam that can be easily retrofitted in existing microscopes and demonstrate its application, showing it can tile nearly perfectly and deliver cryo-EM imaging with a resolution comparable to conventional setups.Competing Interest StatementThe authors have declared no competing interest.