Z całkowicie odmiennym obrazem spotykamy się w polu animalnym

Pomimo że w stadium dojrzałej blastuli zasadnicze tendencje rozwojowe strefy marginalnej są już ustalone, to jednak możliwości różnicowania się jej części są tutaj daleko większe aniżeli w trakcie prawidłowego rozwoju.

Z całkowicie odmiennym obrazem spotykamy się w polu animalnym, które stanowi, jak wiadomo, częściowo presumptywny nabłonek, a częściowo przyszły układ nerwowy zarodka. Niezależnie od tego, z którego z tych rejonów pola animalnego pochodzą eksplantaty, różnicują się one zawsze tylko w elementy epidermalne, a nigdy w struktury układu nerwowego.

Na brak zdeterminowania tendencji rozwojowych komórek pola animalnego wskazują także doświadczenia transplantacyjne. Przeszczepienie komórek presumptywnej ektodermy do strefy marginalnej lub wegetatywnej powoduje przekształcenie się ich w takie elementy, w jakich otoczenie zostały one przeniesione, a więc w komórki mięśniowe, komórki struny grzbietowej, jelita lub jeszcze inne. Komórki pola animalnego mogą się różnicować praktycznie we wszystkie tkanki ciała i dlatego mówimy o nich, że są omnipotencjalne.

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