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http://www4.rcsb.org/pdb/explore/remediatedSequence.do;jsessionid=A12F1EEC209A0136ABA161C55346AF68?structureId=3J3Q&params.chainEntityStrategyStr=all&forcePageForChain=IK

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