Transmission electron micrograph showing the inactive X chromosome (labeled Sex Chromatin), and also known as the Barr body, adpressed to the nucleolus in this section through the nucleus of a spinal cord neuron from a female cat. The inactive X chromosome is typically highly condensed, in keeping with the observation that it is largely inactive in transcription.
Originally from S. Palay (1976), The Fine Structure of the Nervous System, reprinted with permission as Figure 136 from Chapter 4 (Nucleus) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A PDF copy of the corresponding chapter is available on the ASCB's BioEDUCATE website.
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