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[Aadill]

Although it's wikipedia, the mention of glycoalkoloid production on an unearthed potato leads me to believe that it is still an accurate statement.

http://en.wikipedia.org/wiki/Solanine

This also somewhat corroborates that:

http://www.drweil.com/drw/u/id/QAA252785

http://culinaryarts.about.com/od/pot...p/solanine.htm