- Additionally, for PCAs performed with older versions of Jalview and
- the Blosum62 matrix, it is also necessary to import the legacy
- BLOSUM62 score matrix (which is asymmetric for mutations between C to
- R) which can be downloaded at
- http://www.jalview.org/examples/legacyBlosum62.scm
+ This script enables the legacy PCA mode where gaps were treated as
+ 'X', and to modify the BLOSUM62 matrix so it is asymmetric for
+ mutations between C to R (this was a typo in the original Jalview
+ BLOSUM62 matrix which was fixed in 2.10.2).