The domain within your query sequence starts at position 499 and ends at position 552; the E-value for the 3nfl domain shown below is 4e-30.

SSPEKSTPNGGIPHDNLVLIKMKPDENGRFGFNVKGGYDQKMPVIVSRVAPGTP

This is a PDB domain - please see the PDBSUM entry of 3nfl for further annotation