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. TEM taken on 2/16/76 by R. Allen with Hitachi HU11A operating at 75kV. Neg. 14,579X. Bar = 0.25µm.
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