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PDB ID:   with biological assembly (unit): No Yes
     or upload a local file:
Chain ID: (e.g., A or AB, or leave blank for all chains)
Model No.: (for NMR solved structures)
No. of node(s) to represent a nucleotide: 1-node 3-node
Cutoff for amino acid nodes (Å):
Cutoff for nucleotide nodes (Å):
Spring constant for contact distance ≤ 4.0 Å: 
Distance scaling factor for spring constant: 
Environment GNM:
     using crystal contacts as environment: No Yes
     or using chain(s) as system (e.g., A or AB; remains are environment)
     or using the first residues as system (e.g., 100; remains are environment)
Molecular viewer: JsMol Jmol (fast response for big structures)
Email: (optional except for big PDB with 2000+ nodes)



The server is maintained by Dr. Hongchun Li in the Bahar Lab at the Department of Computational & Systems Biology at the University of Pittsburgh, School of Medicine, and sponsored by the NIH awards #5R01GM099738-04 and #5P41GM103712-03 and the funding #104-2113-M-007-019 from MOST to the Yang lab at the National Tsing Hua University, Taiwan.

For questions and comments please contact Hongchun Li.