code: @Override
  	public void toPDB(StringBuffer buf){
  		 Formatter formatter = new Formatter(new StringBuilder(),Locale.UK);
  //        DBREF  3ETA A  990  1295  UNP    P06213   INSR_HUMAN    1017   1322
  //        DBREF  3EH2 A    2   767  UNP    P53992   SC24C_HUMAN    329   1094
  //        DBREF 3EH2 A    2   767     UNP   P53992  SC24C_HUMAN   329   1094
  //        DBREF  3ETA A  990  1295  UNP    P06213   INSR_HUMAN    1017   1322
  		formatter.format("DBREF  %4s %1s %4d%1s %4d%1s %-6s %-8s %-12s%6d%1c%6d%1c            ",
  				idCode, chainName,seqbegin,insertBegin,seqEnd,insertEnd,
  				database,dbAccession,dbIdCode,
  				dbSeqBegin,idbnsBegin,dbSeqEnd,idbnsEnd
  				);
  
  		buf.append(formatter.toString());
  		formatter.close();
  
  	}
docs: Append the PDB representation of this DBRef to the provided StringBuffer
  
  @param buf the StringBuffer to write to.