Practice

There are a number of alignment packages that can be called from R.

  • msa: calls ClustalW, ClustalOmega, and MUSCLE (BioConductor package)
  • ips: calls mafft and prank.
  • ape: calls ClustalW, MUSCLE, T-Coffee

In addition, alignment programs can be called via system calls.

I will go through a worked example, showing how difficult it can sometimes be to align highly variable sequences, followed by an exercise involving simulated data, for which the true alignments are known.