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HAAD is a computer algorithm for constructing hydrogen atoms from protein heavy-atom structures. The hydrgen is added by minimizing atomic overlap and encouraging hydrogen bonding. The excutable program can be downloaded at haad and the source code is downloadable at haad.f90 . More detail can be seen in README.

Cut and paste your structure in PDB format here:

Or upload the structure file from your local computer:

Email: (Optional, where results will be sent to)
References:
Yunqi Li, Ambrish Roy and Yang Zhang, HAAD: A Quick Algorithm for Accurate Prediction of Hydrogen Atoms in Protein Structures, PLoS One, 2009 4: e6701. (download the PDF file)

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