A two dimensional plot is generated. The sequence is placed along
each of the axes. Little squares indicate that the corresponding
residues on the two axes make at least one atomic contact in the
A contact is defined as two atoms for which the distance between
the Van der Waals surfaces is less than 1.0 Ångstrom.
WHAT IF uses the following Van der Waals radii: C:1.8 Ångstrom;
O:1.4 Ångstrom; N:1.7 Ångstrom; S:2.0 Ångstrom.
If you have detected any error, or have any question or suggestion,
please send an Email to Gert Vriend.
Roland Krause, Maarten L Hekkelman, Jens E Nielsen,