From the "Sequence" page you can query the ELISA database with a selection of either

PDB identifier: (ex: 12as)
or
SWISS prot identifier: (ex:P15471 , or CXA1_CONST)
or
a sequence in FASTA format:
(ex: >DOMAIN name
SEQUENCE of that domain)
An E_val threshold textfield is available to set the resulting data at a particular BLAST sensitivity level. (Note that the default E_value threshold is 0.1)
 *In order for the resulting BLAST program to work properly, only one of the three given input options may be selected. This, however, does not include the E_val threshold textfield that can be implement with any of the users selection.
           The query is compared to the rest of the ELISA database and the closest homologues below E_value are displayed on the answer page along with structure, function, and BLAST result information.