THE ERGASTOPLASM IN THE MAMMARY GLAND AND ITS TUMOURS 1 73 



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Fig. 3. Higher magnification of ergastoplasm in the cell of a lactating mammary 

 gland. "Organized" ergastoplasm is typically made of RNP-granules attached to 

 the surface of the endoplasmic reticulum, N = nucleus, x 51 500. 



