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For e x a m p l e , genes specifying p i t u i t a r y h o r m o n e s m u s t act only in t h e relatively small n u m b e r GENETICS OF C E L L TYPE DETERMINATION 33 3 o f c e l l s i n t h e p i t u i t a r y itself, a n d b e k e p t i n a c t i v e e l s e w h e r e . O t h e r w i s e e v e n a v e r y l o w level of s y n t h e s i s in t h e g r e a t m a s s of cells of t h e b o d y as a w h o l e s h o u l d give d e t e c t a b l e h o r m o n e levels in h y p o p h y s e c t o m i z e d a n i m a l s , a n d t h i s is n o t t h e c a s e .

Soc. Symp. 1976) indicates that nuclei of an established cell line, derived originally from Xenopus kidney, when transferred into Pleurodeles oocytes, are reprogrammed to produce certain proteins which are normally produced in the oocyte and not in the donor cell line.

T h e m a i n p o i n t o f a l l o f t h i s is t o i n d i c a t e t h a t n u c l e i m a y b e r e s t r i c t e d i n t h e i r f u n c t i o n i n w a y s so s t a b i l i z e d as to b e irreversible o r v e r y difficult to reverse, a n d to suggest t h a t this m a y b e a factor l i m i t i n g t h e d e v e l o p m e n t of n u c l e a r - t r a n s p l a n t embryos. Can restrictions in the developmental capacity of transplanted somatic nuclei be reversed? T w o t y p e s o f e x p e r i m e n t s w i l l b e d e s c r i b e d .

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