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PLATE XIV. Mitochondria of a pancreatic cell (guinea pig) showing the continuous outer membrane, 

 the inner membrane to which the cristae are attached, and the matrix which is much denser than 

 the surrounding cytoplasm. Mitochondria which appear to be dividing may be caught in a twisted 

 configuration (arrows). 53,000 X- (Courtesy of G. E. Palade.) 



