Dmitry A. Afonnikov Dmitry Yu. Oshchepkov Nikolay A. Kolchanov Detection of conserved physico-chemical characteristics of proteins by analyzing clusters of positions with co-ordinated substitutions. 1035-1046 2001 17 Bioinformatics 11 db/journals/bioinformatics/bioinformatics17.html#AfonnikovOK01 http://dx.doi.org/10.1093/bioinformatics/17.11.1035