how to perform functional enrichment on pangenome data

Question

[Neel]

Hi, I have read this paper https://www.microbiologyresearch.org/content/journal/mgen/10.1099/mgen.0.000309#tab2, where author had done pangenome and their functional annotation. Now i am unable to figure out how did they perform functional enrichment analysis, i.e. the input file for topGO analysis how did they prepared. sorry for silly question but i am stuck here.

Thank you!