What is the best way to cite NCBI data for my paper? I'm currently writing my paper, and I have to compare some DNA sequences. But I found some samples have already been analyzed.

So I used analyzed data from NCBI and my own new data (different species) for the comparison.

Now I want to state clearly that I used their data in my paper.
What is the best way to do it?

Should I write their GeneBank accession No. and put the papers in my references?

I'm worried if that is not enough. Should I contact the authors of the paper?
The way to cite NCBI databases, services, and data is described by NCBI itself in an "NCBI Knowledgebase" post here: https://support.nlm.nih.gov/knowledgebase/article/KA-03391/en-us

In addition, NCBI provides a separate file with lots of examples:  ftp://ftp.ncbi.nlm.nih.gov/pub/education/supportcenter/NCBI_services_citation_examples.txt 

Don't guess, look it up !

(Archived permalink: https://web.archive.org/web/20181028213653/https://support.nlm.nih.gov/knowledgebase/article/KA-03391/en-us)