An official website of the United States government

Here's how you know
The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

NLM Catalog: Journals referenced in the NCBI Databases Limit your NLM Catalog search to the subset of journals that are referenced in NCBI database records