Phylogenetic Distribution of Metagenomes

[sdpapet]

Hello, I have several questions about the function of "Phylogenetic Distribution of Metagenomes" on IMG/MER

1>What is the normal cutoff that I should choose? 30+% 60% or 90%?
2>The website says "phylogenetic distribution of genes for selected metagenomes". Here the "distribution of genes" means all functional genes or just phylogenic gene markers such as 16SrRNA.
3>When compared, which data base do you use? COG? KO?

Thanks,
Ben

[sdpapet]

Anyone knows?

Thanks