[BioC] Finding GO leaf nodes for an ontology - which package?

[John Zhang]

>
>I was trying to list all the leaf nodes for a particular ontology. For this, I 
was using the GOstats:
>
>g1 <- oneGOGraph("GO:0003674", GOMFCHILDREN)
>g2 <- GOleaves(g1)
>
>Hopefully, this would give me a list of all the leaf nodes for the molecular 
function ontology. But this is taking too long to execute.
>
>Is there a similar function in some other package that would be quicker?

Just for the GO ids:

>library(GO)
>leafGOs <- get("GO:0003674", GOMFCHILDREN)



>
>thanks!
>
>       
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Jianhua Zhang
Department of Medical Oncology
Dana-Farber Cancer Institute
44 Binney Street
Boston, MA 02115-6084