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http://www3.rcsb.org/pdb/explore/remediatedSequence.do;jsessionid=7258BC5C5FD0D9A5BD862C18C6F3C1C6?page=318&forcePageForChain=&structureId=3J3Q

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