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By Stephen Subtelny

ISBN-10: 0126129835

ISBN-13: 9780126129830

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A, 2-cell stage. B, 64-cell stage. X 3 0 0 . p r o g r e s s i v e cleavages into t h e p r e s u m p t i v e tail m u s c l e cells of t h e developing larva. T h i s is illustrated in Fig. 2 with p h o t o g r a p h s f r o m a related species, Styela plicata. O n l y quite r e c e n t l y h a v e w e learned t h a t this colored c r e s c e n t of s o m e species is c a u s e d by p i g m e n t e d yolk g r a n u l e s a d h e r e n t t o m i t o c h o n d r i a which a r e s e g r e g a t e d into t h e s e cells ( B e r g and H u m p h r e y s , 1 9 6 0 ) ; w o r k of several i n v e s t i g a t o r s o v e r t h e y e a r s had established t h a t a large n u m b e r of m i t o c h o n d r i a a r e s e g r e g a t e d i n t o t h e p r e s u m p t i v e m u s c l e cells even of t h o s e species in w h i c h t h e r e a r e n o easily observable c r e s c e n t s .

T h e possible role of R N A as a m o r p h o g e n e t i c d e t e r m i n a n t is a problem which is not e n c o u n t e r e d in polar lobes only. T h e g e r m plasm in t h e eggs of insects and amphibians also c o n t a i n s R N A (Blackler, 1 9 5 8 ; M a h o w a l d , 1 9 7 1 ) , but its role, if any, in d e t e r m i n i n g g e r m cells is n o t y e t k n o w n . M o r p h o g e n e t i c R N A is not necessarily m e s s e n g e r R N A . F r o m chick e m b r y o n i c h e a r t D e s h p a n d e et al.

1957). Arch. Biol. Liege 6 8 , 1 1 5 - 1 6 3 . , Guerrier, P. and Bergerard, J. (1974). J. Embryol. Exp. Morphol. 3 1 , 6 1 - 7 4 . Pucci, I. (1961). Ada Embryol. Morphol. Exp. 4, 9 6 - 1 0 1 . , Minafra, S. R. (1969). Exp. Cell Res. 57, 1 6 7 - 1 7 8 . D. R. (1976). Amer. Zool. 16, 5 2 9 - 5 4 5 . Rambourg, A. (1967). /. Histochem. Cytochem. 15, 4 0 9 - 4 1 2 . Raven, C P . (1970). Int. Rev. Cytol. 2 8 , 1-44. Reverberi, G. (1970). Acta Embryol. Exp. 12, 3 1 - 4 3 . Reverberi, G. (1972). Acta Embryol.

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Determinants of Spatial Organization by Stephen Subtelny

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