karyotheca
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karyotheca
[kar″e-o-the´kah]the nuclear membrane.
nu·cle·ar en·ve·lope
the double membrane at the boundary of the nucleoplasm; it has regularly spaced pores covered by a disclike nuclear pore complex and a space or cisterna about 150 Ǻ wide between the two membranes; the outer membrane is continuous at intervals with the rough endoplasmic reticulum.