Rat spleen showing a red blood cell leaving the cord and deforming to pass through a slit in the wall of the sinus. Slide provided by Dr Mohandas Narla. Reproduced with permission from: Mohandas Narla. Red cell membrane dynamics and organization. In: UpToDate, Basow, DS (Ed), UpToDate, Waltham, MA 2012. Copyright © 2012 UpToDate, Inc. For more information visit www.uptodate.com.