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By W. D. Stein

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T h e r e will b e m a n y s i t u a t i o n s — c o n s i d e r , for e x a m p l e , t h e globular particles f o r m i n g t h e m e m b r a n e of t h e m i t o c h o n d r i o n as these a p p e a r in t h e electron m i c r o g r a p h s of Sjostrand ( f o r example, F i g . 1 . 1 9 ) — w h e r e cell organelles or c o m p o n e n t s of o r g a n e l l e s contain c o n s i d e r a b l e amounts of lipid, y e t a r e smaller than t h e 3 0 0 - A d i a m e t e r structures of F i g . 16.

1 0 ) . T h e myelin sheath forms an excellent o b j e c t for X - r a y crystallographic analysis ( F i n e a n , 1 9 6 1 ) , displaying a regularly r e p e a t i n g array of conc e n t r i c units of s p a c i n g 1 5 0 - 1 8 0 A ( i n different s p e c i e s ) . T h e s e r a t h e r large units are divided into t w o very similar halves, e a c h h a l f being therefore some 7 5 - 9 0 A, a good value for the unit m e m b r a n e . O p t i c a l Fig. 9. Diagrams illustrating the successive stages (a, b, c) of the development of nerve myelin.

8 proves to b e valid for t h e true cell m e m b r a n e s of t h e S c h w a n n cell surrounding t h e nerve axon, a n d t h e suggestion that F i g . 8 represents t h e structure of cell m e m - 22 1. THE ANATOMY OF THE PLASMA MEMBRANE branes generally c a n b e d e f e n d e d n o w b y induction from one specific cell m e m b r a n e t y p e to t h e generality, as well as b y t h e analogy with t h e myelin forms. 5 Physical Stability of the Bimolecular L i p i d Leaflet T h e study of t h e myelin forms ( S e c t i o n 1 .

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