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_64 or HAAD_32 for 64/32 bit versions. The source code is downloadable at haad.f90 . More detail can be seen in README.

Cut and paste your structure here: Or upload the structure file from your local computer: Email: (Optional, where results will be sent to)

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References:
Yunqi Li, Roy Ambrish 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)