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A freeze-fractured view of the nuclear envelope. The fracture in the
middle of the figure exposes the cytosolic facing membrane. This can
be distinguished by a fractured cytoplasmic organelle at the top of
the picture. The lower part of the picture shows the
nucleoplasm-facing membrane of the envelope. The nuclear pores
penetrate through both membranes. It is not clear if the membranes
have actually fractured along their hydrophobic centers or if the true
surfaces of these two membranes are being viewed. EM taken on 2/16/76
by R. Allen with Hitachi HU11A TEM. Neg. 14,579X. Bar = 0.25µm.
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