PDB ID is a string of four alphanumeric like 1ZNE.<br>
<B>Please specify a valid PDB ID, and try again:</B>
<table><form  method="GET" action="/jsp/dbsearch/PrimarySearch_pdbids.jsp">
<tr><input type="text" name="pdbids" size="4"> </br>
<input type="submit" value="Search" name="pdbids_submit"></td></tr>
</table>