Shuichi Kawashima Piotr Pokarowski Maria Pokarowska Andrzej Kolinski Toshiaki Katayama Minoru Kanehisa AAindex: amino acid index database, progress report 2008. 202-205 2008 36 Nucleic Acids Research Database-Issue http://dx.doi.org/10.1093/nar/gkm998 db/journals/nar/nar36.html#KawashimaPPKKK08