26 



MICROSOMAL PARTICLES 



without the attached granules. The fact that three varieties of microsomes have 

 been defined is not intended to imply that any of these varieties of microsomes 

 is itself homogeneous. 



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2. N. Penn and B. Mackler, Federation 

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3. M. L. Petermann and M. G. Hamil- 

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4. D. Garfinkel, unpublished experi- 

 ments. 



5. G. E. Palade and P. Siekevitz, /. Bio- 

 p/iys. Biochem. CytoL, 2, 671 (1956). 



6. D. Garfinkel, Arch. Biochem. Bio- 

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7. P. Strittmatter and S. F. Velick, 

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