Spemann Organizer ·
The Dorsal Lip That Builds a Second Embryo
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.com · chordin · noggin · BMP4 antagonism
Phase
—
BMP4 neutralized
0
State
—
Organizer (dorsal lip)
BMP4 (ventral)
Chordin / Noggin
Neural fate (low BMP)
Epidermis (high BMP)
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.com · The Spemann-Mangold Organizer