title: Why are polar residues within the membrane core evolutionary conserved?
authors.affiliation: Department of Biochemistry and Biophysics, Center for Biomembrane Research, Stockholm bioinformatics Center, Stockholm University, SE-106 91 Stockholm, Sweden.
authors.forename: Kristoffer
authors.initials: K
authors.lastname: Illergård
authors.forename: Anni
authors.initials: A
authors.lastname: Kauko
authors.forename: Arne
authors.initials: A
authors.lastname: Elofsson