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rentrez provides functions to search for, discover and download data from the NCBI's databases using their EUtils function.


Users are expected to know a little bit about the EUtils API, which is well documented:

The NCBI will ban IPs that don't use EUtils within their user guidelines. In particular /enumerated /item Don't send more than three request per second (rentrez enforces this limit) /item If you plan on sending a sequence of more than ~100 requests, do so outside of peak times for the US /item For large requests use the web history method (see examples for entrez_search or use entrez_post to upload IDs)