# Why does the Genbank phylogenetic tree of 4000 sars-cov-2 sequences only display 200 nodes?

I manually selected all 4000 sequences on the 20 pages of the SARS-CoV-2 sequences on genbank here.

When I click on Build phylogenetic tree, it only has 200 nodes.

Is this expected? I was expecting to see 4000 nodes.

Is it simply a displaying issue where only 200 sequences per page are revealed while browsing the list of sequences? Is there a way to get the tree for all 4000 sequences?

• Hi @shadi, I would assume the NCBI tree building program is restricted to 200 taxa/nodes. Please note a "node" is different from a "taxon" (optimal taxonomic unit). – M__ May 23 '20 at 6:09
• Makes sense. Do you know if there's any option to export the full phylogenetic tree? I'm assuming that they restrict to 200 just because of the display limits. – Shadi May 24 '20 at 7:20