Pattern Regeneration in an Insect Segment
The integument of an insect segment displays a sequence of differentiated cells and a polarity pattern of uniformly oriented cuticular protrusions. It has been proposed that both pattern features are controlled by the concentration gradient of some diffusible morphogen. I report that an abnormal cell sequence is repaired by cell sorting and/or by intercalary regeneration of missing pattern elements. Patterning in the intercalary regenerate need not,though may, rely on a graded morphogen concentration. A disturbed polarity pattern, on the other hand, repairs itself by cell interactions that operate independently of a gradient.
KeywordsAbdominal Segment Polarity Pattern Gradient Model Insect Epidermis Segment Polarity Gene
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