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http://www.rcsb.org/pdb/results/results.do;jsessionid=9D728F1D8B3BDFDBF6234FD9CCC73791?tabtoshow=Citation&qrid=683C2A5E

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.

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: