“The biochemical basis of an all-or-none cell fate switch in Xenopus oocytes.”

Progesterone

AA Mos Mos-P

Mek Mek-P

Mapk Mapk-P

k1 k2

k-1 k-2

Science 1998;280:895-8 Ferrell & Machleder, (Pub)

positive

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