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Carl and Martin-
I doubt this. It is well-known that mammalian cells exposed to the
cold depolymerize all their microtubules. The keratin network goes
into a ball near the nucleus. The work on microtubule depolymerization
pre-dates my education in EM, so I don't remember the reference. The
work on the keratin collapse was published by Bob Goldman back in ~1970
or the early-mid '70s.