The X chromosome is organized into a gene-rich outer rim and an internal core containing silenced nongenic sequences.
Clemson CM, Hall LL, Byron M, McNeil J, Lawrence JB. The X chromosome is organized into a gene-rich outer rim and an internal core containing silenced nongenic sequences. Proc Natl Acad Sci U S A. 2006 May 16; 103(20):7688-93.