code: private Structure loadStructureFromMmtfByPdbId(String pdbId) throws IOException {
  		logger.debug("Loading structure {} from mmtf file.", pdbId);
  		MMTFFileReader reader = new MMTFFileReader();
  		reader.setFetchBehavior(fetchBehavior);
  		reader.setObsoleteBehavior(obsoleteBehavior);
  		Structure structure = reader.getStructureById(pdbId.toLowerCase());
  		return structure;
  	}
docs: Load a {@link Structure} from MMTF either from the local file system.
  @param pdbId the input PDB id
  @return the {@link Structure} object of the parsed structure
  @throws IOException error reading from Web or file system