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What are these large multinucleated cells??? - (Dec/15/2011 )

I have been culturing NIH3T3 and MC3T3-E1 cells and have been finding large, multinucleated cells in both of the cultures. Not a lot, but enough to notice. I've attached a picture of one of them (in my NIH3T3s) after staining with crystal violet. What are they? Thanks!
Attached Image


Senescent cells.