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• W2591330651 abstract "Cellular Electron CryoTomography (CECT) enables 3D visualization of cellular organization at near-native state and in sub-molecular resolution, making it a powerful tool for analyzing structures of macromolecular complexes and their spatial organizations inside single cells. However, high degree of structural complexity together with practical imaging limitations makes the systematic de novo discovery of structures within cells challenging. It would likely require averaging and classifying millions of subtomograms potentially containing hundreds of highly heterogeneous structural classes. Although it is no longer difficult to acquire CECT data containing such amount of subtomograms due to advances in data acquisition automation, existing computational approaches have very limited scalability or discrimination ability, making them incapable of processing such amount of data.To complement existing approaches, in this article we propose a new approach for subdividing subtomograms into smaller but relatively homogeneous subsets. The structures in these subsets can then be separately recovered using existing computation intensive methods. Our approach is based on supervised structural feature extraction using deep learning, in combination with unsupervised clustering and reference-free classification. Our experiments show that, compared with existing unsupervised rotation invariant feature and pose-normalization based approaches, our new approach achieves significant improvements in both discrimination ability and scalability. More importantly, our new approach is able to discover new structural classes and recover structures that do not exist in training data.Source code freely available at http://www.cs.cmu.edu/∼mxu1/software .mxu1@cs.cmu.edu.Supplementary data are available at Bioinformatics online." @default.
• W2591330651 created "2017-03-03" @default.
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• W2591330651 date "2017-07-12" @default.
• W2591330651 modified "2023-10-15" @default.
• W2591330651 title "Deep learning-based subdivision approach for large scale macromolecules structure recovery from electron cryo tomograms" @default.
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• W2591330651 doi "https://doi.org/10.1093/bioinformatics/btx230" @default.
• W2591330651 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5946875" @default.
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