Collagen fibers, a component of fibrotic tissue, interact with polarized light but weakly. The butterfly wing amplifies collagen signals from biopsies. This makes it easier to analyze the density ...

Here, we present the 3.4-Å resolution structure of fibrils of full-length recombinant tau protein in the presence of RNA, determined by electron cryomicroscopy (cryo-EM). The structure reveals the ...