“…The lipid analyses of the fluffy layer are consistent with it being a mixture of mitochondria and microsomes. This has been suggested by Novikoff, Podber, Ryan & Noe (1953) and by Miller, Bagot & Greenberg (1955), but in contrast Laird, Nygaard, Ris & Barton (1953) believe that the fluffy layer contains a distinct kind of mitochondria. Jackson, Walker & Pace (1953) believe that the fluffy layer belongs to the microsomal fraction.…”