3cqc is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
↑Boehmer T, Enninga J, Dales S, Blobel G, Zhong H. Depletion of a single nucleoporin, Nup107, prevents the assembly of a subset of nucleoporins into the nuclear pore complex. Proc Natl Acad Sci U S A. 2003 Feb 4;100(3):981-5. Epub 2003 Jan 27. PMID:12552102 doi:http://dx.doi.org/10.1073/pnas.252749899