Key points are not available for this paper at this time.
msa is available via the Bioconductor project: http://bioconductor.org/packages/release/bioc/html/msa.html. Further information and the R code of the example presented in this paper are available at http://www.bioinf.jku.at/software/msa/.
Bodenhofer et al. (Wed,) studied this question.