The HMMTOP transmembrane topology prediction server predicts both the local
ization of helical transmembrane segments and the topology of transmembrane
proteins. Recently, several improvements have been introduced to the origi
nal method. Now, the user is allowed to submit additional information about
segment localization to enhance the prediction power. This option improves
the prediction accuracy as well as helps the interpretation of experimenta
l results, i.e. in epitope insertion experiments.