The hair was growing in the gingival cavities and could be seen upon necropsy (see photo above). By the third generation of a diet heavy in GM-soy the hair growth was extensive and most hamsters were infertile.
I almost forgot to thank you for the photos and further info indicating that they were eating GMO soy. Great source for nightmares ... hairy mouthed hamsters. Ew. It's almost like Attack of the Killer Tomatoes type movies.