http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=retrieve&db=pubmed&list_uids=16815920&dopt=Abstract
Protein Sci. 2006 Jul;15(7):1723-34.
A limited universe of membrane protein families and folds.
Oberai A, Ihm Y, Kim S, Bowie JU.
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