A new version of FirstGlance in Jmol <http://firstglance.jmol.org> is released. Shift-Reload or clear the cache in your browser to ensure you are using version 3.51. It should help to de-mystify electron density maps <https://proteopedia.org/w/Density_maps> by making them super easy to look at -- both for X-ray, and for Electron Microscopic Coulombic density maps. You simply "Find" a few residues (click "Find.." in the Focus Box <https://proteopedia.org/wiki/fgij/where.htm#focusbox>, and for example with 1ijw enter Ser174,DA10), whereupon the density map is just one more click. Bob Hanson was a huge help, making simple Jmol commands do a lot of work behind the scenes. See slides 5-6 showing FirstGlance-generated animations of density maps at tinyurl.com/movingmolecules <http://tinyurl.com/movingmolecules>. For educators and students, this new version starts up in a *simplified mode*, with less details cluttering the Molecule Information Tab and hiding advanced tools in the Tools tab. Thanks to Gabriel Pons for motivating me to do this. Click "Show More Details" only if you want detailed analyses of alternate locations (which can be animated <https://proteopedia.org/w/Alternate_locations#Visualizing_alternate_locations>) and occupancies, counts of incomplete sidechains, various protein crosslinks, related PDB entries, one-click access to view the PDB data file contents, coloring by temperature/B factor, etc. This version automatically detects likely cases of the following covalent protein crosslinks <https://proteopedia.org/w/Protein_crosslinks> (in addition to disulfide bonds, already in FirstGlance for years): _isopeptide crosslinks, thioester crosslinks, thioether crosslinks, ester crosslinks, His-Tyr crosslinks, and Lys-Cys NOS crosslinks_ (first reported a few months ago). Clicking on one crosslink zooms in and shows it in detail, with the electron density map being one further click. Examples <https://proteopedia.org/wiki/fgij/versions.htm#crosslinks>. Thanks to Amr A. Alhossary for finding some of the examples. Feedback always welcome! -Eric Eric Martz, Professor Emeritus, Dept Microbiology (he/him/his) Univ. Massachusetts, Amherst -- Martz.MolviZ.Org <http://martz.molviz.org/> Guided Exploration of Macromolecules with Powerpoint-Ready Animations: FirstGlance.Jmol.Org <http://firstglance.jmol.org/> Protein 3D Structure Wiki: Proteopedia.Org <http://proteopedia.org/w/User:Eric_Martz> Education: Biochem in 3D at MolviZ.Org <http://molviz.org/> Find Functional Patches in Proteins: ConSurf.tau.ac.il <http://consurf.tau.ac.il/> Atlas of Macromolecules: Atlas.MolviZ.Org <http://atlas.molviz.org/> See multiple protein sequence alignments clearly: MSAReveal.Org <http://msareveal.org/> Pockets And Cavities Using Pseudoatoms in Proteins: PACUPP <http://molviz.org/pacupp> Interactive Molecules in Architectural Spaces: MolecularPlayground.Org <http://molecularplayground.org/> Syllabi: Workshops.MolviZ.Org <http://workshops.molviz.org/>