Maintenance announcement: the ExPASy portal will be temporarily inaccessible on Friday, 31 July 2015 from 11:00 to 11:30 CEST.

In June 2011 the SIB ExPASy Bioformatics Resources Portal was launched by the SIB Swiss Institute of Bioinformatics. In particular, ExPASy has been designed, developed and maintained by the SIB Web Team in co-operation with several other SIB groups and ExPASy users. ExPASy is an extensible and integrative portal accessing many scientific resources, databases and software tools in different areas of life sciences. Refer to Features for more details. The portal enhances the original ExPASy server, previously known as "Expert Protein Analysis System"

Originally, ExPASy was created in August 1993: it was one of the first Web servers for biological sciences. Since that date it has undergone constant modifications and improvements. Please contact the ExPASy Helpdesk if you have comments or encounter problems when using it.

In case of scientific publication, the SIB Swiss Institute of Bioinformatics should be mentioned. You can cite the following publication:

Artimo P, Jonnalagedda M, Arnold K, Baratin D, Csardi G, de Castro E, Duvaud S, Flegel V, Fortier A, Gasteiger E, Grosdidier A, Hernandez C, Ioannidis V, Kuznetsov D, Liechti R, Moretti S, Mostaguir K, Redaschi N, Rossier G, Xenarios I, and Stockinger H. ExPASy: SIB bioinformatics resource portal, Nucleic Acids Res, 40(W1):W597-W603, 2012.