Simply click on the name of a lab to view all the plates that have been loaded into the database for that lab. Then, choose a plate, followed by a plant line and an est accession to drill down to the actual sequence data. Once you have the sequence data open, you can switch between est accessions, or go back and drill down again from another level.

It's also possible to search directly for a given sequence by choosing search above, and then following the directions under How To: Look for Sequences.