It would be most helpful if participants with mtDNA results would notify the project administrators when they have a direct-line, most distant matrilineal female ancestor who was an Armstrong by birth.  This information might help us establish base-line mtDNA signatures or haplotypes for reference in future research. 

See for additional general information: http://freepages.genealogy.rootsweb.com/~donegalstrongs/armstrong.htm (Note: all one-line URL). The page is no longer being maintained, but has some useful links, and may be useful for archival reference purposes.