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http://www4.rcsb.org/pdb/explore/remediatedSequence.do;jsessionid=4503AD7C3E3404B48B51AAE4ED5E47CC?page=108&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