GFSST is a robust retrieval tool for genes and gene products 
based on heir associated GO terms. Searching with GO terms
allows more flexibility than searching with a source protein.
Users can design their search by using one or multiple GO terms. 
 
Given the following terms in Cellular Component Ontology,
search genes by funtional similarlity:

GO:0005789; Cellular component: endoplasmic reticulum membrane (inferred from direct assay).
GO:0000139; Cellular component: Golgi membrane (inferred from direct assay).
GO:0016021; Cellular component: integral to membrane (traceable author statement).
GO:0042824; Cellular component: MHC class I peptide loading complex (non-traceable author statement).
GO:0005792; Cellular component: microsome (non-traceable author statement). 

Try this example, copy the following GO IDs and paste into the Cellular Component GO IDs box.
Then click the "Submit Query" Button.

0005789 0000139  0016021 0042824 0005792