![]() Data and materials availability: Atomic models are available through the Protein Data Bank (PDB) with accessions codes 6CVJ (R1×4) and 6CVN (R2×4) all cryo-EM reconstructions are available through the EMDB with accession codes EMD-7520 (2R tau), EMD-7523 (4R tau), EMD-7522 (full-length tau), EMD-7769 (R1×4 tau), and EMD-7771 (R2×4 tau). Learn how protons & electrons comprise atoms and how this is the basis of the periodic table. Competing interests: The authors declare no competing interests. Get an introduction to atomic models with our online tutorial. ![]() writing (review and editing), all authors funding acquisition, E.N. In 1922, the American physicist Arthur H. investigation, E.H.K., N.M.A.H., F.D., and E.N. The development of quantum mechanics served as the foundation of the modern atomic theory. Author contributions: Author contributions were as follows: conceptualization, E.H.K., N.M.A.H., and E.N. is a Howard Hughes Medical Institute Investigator. An atom is a complex arrangement of negatively charged electrons arranged in defined shells about a positively charged nucleus. Orbital An atom has an atomic nucleus with a (+) charge at the center and electrons with a negative charge around it. ![]() Funding: This work was funded by a BWF collaborative research travel grant (008185) (E.H.K.) and NIHGMS grants K99GM124463 (E.H.K.), GM123089 (F.D.), and GM051487 (E.N.). Although the most commonly used model of the atom is the Bohr model, scientists are still developing new and improved theories on what the atom looks like. ![]() Greber for help with initial model building. Grigorieff for help with implementing phase plate support in frealign. ![]()
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