How to interpret two letter codes of COG category obtained from EggNOG tool?

Question

[Kumar]

I have performed COG category analysis for the core genes obtained from roary pipeline using EggNOG Database. Most of the genes were assigned two and three letter codes in the COG_category. For example, chemotaxis protein categorized in NT, serine aminopeptidase categorized in KLT. I do not know how to interpret this result. Based on this interpretation only, I could able to plot the pie chart for the same. Therefore, please help me to do the same.

Thank you in advance.

Answer 1

[GenoMax]

COG category codes are on NCBI COG page. NT = N + T.

Answer 2

[Mensur Dlakic]

Easy to find by Googling:

https://ecoliwiki.org/colipedia/index.php/Clusters_of_Orthologous_Groups_(COGs)

Also in this file:

https://ftp.ncbi.nlm.nih.gov/pub/COG/COG/fun.txt