Fig. 5.

(A) Time course of cold-induced dephosphorylation of ribosomal protein S6 in meadow jumping mouse (Zapus, hibernator) and lab mouse (Mus, non-hibernator) cell lines. Recovery was for one hour at 37 °C after 24 hours cold exposure. Cells from the hibernator species exhibit slower loss of S6 phosphorylation, relative to total S6 protein pool (B), suggestive of adaptation to reduced body temperature during torpor.