In a study on regeneration in Planaria, expression of Wnt inhibitor Notum occurred in the cells located at the anterior excision while expression of WntmRNA was observed in the cells present at anterior and posterior excision sites. Which of the following statements justifies the observation?
Inhibition of Notum gene results in the formation of two-headed planaria
Both Wnt and Notum genes regulate the head formation
Wnt gene expression regulates head formation.
Notum gene expression is required for the formation of the head.
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