Fig 1. Ultrastructure of adipocytes in B. terrestris queens: pharate (A), callow (B), before hibernation (C), after hibernation (D), egg-laying (E), and senescent (F).

Scale bars represent 10 μm. Note the flat and highly condensed nucleus prior to hibernation and the initial phase of nucleus elimination in senescent queen. Abbreviations: cv, central vacuole; g, glycogen; ld, lipid droplet; m, mitochondria; n, nucleus; pg, protein granule; rer, rough endoplasmic reticulum.