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Where are all the hydrogen atoms in this file? Should I care about the R-factor? Why are there 20 overlapped structures in my file? Topics cover biological assemblies, molecular graphics programs, R-value and R-free, and more. These questions and many others are explored in PDB-101's Guide to Understanding PDB Data. This resource was created to help users navigate through the contents of the archive without having a detailed background in structural biology.
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