Dear community, I have got a crystal structure of 16Kda protein, which was solved at 1.9 A. Protein crystallised in dimer form and I could observe a continuous extra density between cysteine of two chains. Distance between two intermolecular cysteine is 7.8 A. Please help me to interpret this extra density. Thanks in advance. I have attached the screen shots of the map. Thanks and Regards, Manjula R Research Scholar Department of Biophysics National Institute of Mental Health and Neurosciences Bengaluru-29, Karnataka INDIA E-mail: [log in to unmask] Mobile no:+91-9538553356 http://www.nimhans.kar.nic.in/ <https://www.nimhans.kar.nic.in/>