The PDB Data Extractor component receives PDB IDs as input and fetches additional data about the provided structures like sequences or references to other databases like UniProt or PubMed. The component is using the PDB web service. More information about the PDB database and the editable web service fields in the request can be found here: https://academic.oup.com/nar/article/28/1/235/2384399 https://www.rcsb.org/pdb/results/reportField.do