Ligand validation:4KNB

Error: GraphQL Error (Code: 502): {"response":{"error":"<html><body><h1>502 Bad Gateway</h1>\nThe server returned an invalid or incomplete response.\n</body></html>\n","status":502,"headers":{}},"request":{"query":"\nquery ($entry_id: String!, $entity_id: String!) {\n polymer_entity(entry_id: $entry_id, entity_id: $entity_id) {\n rcsb_polymer_entity_group_membership {\n similarity_cutoff\n group_id\n }\n }\n}","variables":{"entry_id":"4KNB","entity_id":"1"}}}

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.

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