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
the source code is downloadable at
More detail can be seen in
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