I'm using GOstats (version 2.42.0) to perform GO enrichment analysis in a non-model organism.
The input data was obtained from the DE analysis of RNA-Seq data. For the analysis I used an own
gene universe, as well as a sub-list of this genes to run the hypergeometric test. The function
hyperGtest() returned 25 enriched GO-terms. Looking closer to the results I realised that several
GO-terms were not present in my gene universe. How can that happen? Does anyone have an
explanation for that?