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http://www.rcsb.org/pdb/explore/remediatedSequence.do;jsessionid=DA6129B6C8EDE5FCB87E9298C979E865?params.showJmol=true&structureId=4HZR

It has been permanently removed as part of our announced shutdown on December 9th, 2020.

See the Legacy API Shutdown December 9 announcement for further details.


Legacy APIs

If you are using one of the legacy API endpoints, you will need to migrate to the new json-based APIs.

The new APIs provide more comprehensive search and fetch capabilities, see Web Services Overview.

Documentation for the new services and migration guides are available:

Data API tutorial
Search API tutorial
Data API migration guide
Search API migration guide