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Stay up-to-date with API developments by viewing (or subscribing) to the RCSB PDB API announcements Google group.
The Data API and Search API are the two main APIs that power RCSB.org. The Data API serves to retrieve data based on PDB ID while the Search API retrieves PDB is that match given conditions.
Recent announcements to the API Google group include the release of Version 2 Search APIs and the availability of Sequence cluster files now per-polymer entity, instead of per-chain.
Detailed documentation on RCSB PDB Web Service APIs is available.