This area is not yet complete. However, at present it contains several poorly formatted results from a sequence analysis of the hyperthermophilic archeon Pyrobaculum Aerophilum . When doing fold recognition one wants as large a database of chains of known structure with as little redundency as neccessary. Using the entire PDB is dangerous as the statistics will be skewed by the 200 lysozyme structures and other such equivalent structures.
Exceptions arise when partial segments of chains are included with the full chain itself.
The current PDB contains approximately 8000 chains of high redundency. There are several reliable sources of information. I access these particular sites often and find them invaluable resources. The local directory contains fasta and blast format versions of popular, published proteomes. This sequence set contains approximately 350,000 unique sequences.