Source:http://linkedlifedata.com/resource/umls/id/C0028587
MSH: An opening through the NUCLEAR ENVELOPE formed by the nuclear pore complex which transports nuclear proteins or RNA into or out of the CELL NUCLEUS and which, under some conditions, acts as an ion channel.,GO: Any of the numerous similar discrete openings in the nuclear envelope of a eukaryotic cell, where the inner and outer nuclear membranes are joined. [ISBN:0198547684],NCI: An octagonal opening, about 70 nm across, where the inner and outer membranes of the nuclear envelope are continuous.