Determinants of Spatial Organization by Stephen Subtelny

By Stephen Subtelny

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G e u s k e n s and de J o n g h e d'Ardoye ( 1 9 7 1 ) conclude, h o w e v e r , t h a t t h e s e particles a r e α-glycogen r o s e t t e s . Similar s t r u c t u r e s a r e p r e s e n t in t h e egg of Nassarius reticulatus. In this species t h e particles a r e stained by t h e periodic acid-thiocarbohydrazide-silver p r o t e i n a t e m e t h o d ( T h i e r y , 1 9 6 7 ) , w h i c h is specific for polysaccharides. T h e y also s h o w t h e masking effect a f t e r m e t h a n o l i c u r a n y l a c e t a t e staining, w h i c h is specific for glycogen ( B h a t n a g a r and L e e s o n , 1 9 7 5 ) .

R. (1976). Differentiation 6, 47-52. Kühn, A. (1965). "Vorlesungen über Entwicklungsphysiologie". 2nd ed. Springer Verlag, Berlin. P. (1971). } . Exp. Zool. 176, 3 4 5 - 3 5 2 . McCann-Collier, M. (1977). } . Morphol. 1 5 3 , 1 1 9 - 1 2 7 . H. (1933). /. Exp. Zool. 64, 433-467. H. (1935). Biol. Bull. 6 8 , 2 6 8 - 2 7 9 . M. and Raff, R A . (1975). Develop. Biol. 42, 2 4 2 - 2 6 1 . Nuccitelli, R. (1978). Develop. Biol. 62, 13-33. , and Monroy, A. (1977). Exp. Cell Res. 1 0 6 , 4 0 2 - 4 0 4 .

T h e s e A C h E - c o n t a i n i n g cells a r e depicted at v a r i o u s c l e a v a g e - a r r e s t e d s t a g e s in Fig. 5. D e v e l o p m e n t of a localized endoderm-specific alkaline p h o s p h a t a s e b e h a v e s similarly in c y t o c h a l a s i n - a r r e s t e d e m b r y o s ( W h i t t a k e r , 1 9 7 7 ) . T h a t is, e n z y m e develops in t h e cells a c c o r d i n g t o t h e cell n u m b e r and p a t t e r n of e n d o d e r m a l lineage. U p t o t h e 4-cell s t a g e , e v e r y cell h a s t h e potential t o p r o d u c e an i n t e n s e alkaline p h o s p h a t a s e c o n c e n t r a t i o n (Fig.

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