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When was the first experimental evidence provided for axonal outgrowth and motility?

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When was the first experimental evidence provided for axonal outgrowth and motility?

(a) 1907

(b) 1807

(c) 1847

(d) 1947

I got this question by my school teacher while I was bunking the class.

Question is from Non-muscle Motility topic in chapter Cytoskeleton and Cell Motility of Cell Biology

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Correct choice is (a) 1907

The explanation is: Ross Harrison of Yale University performed a classic experiment in 1907 by culturing a piece of tissue from a frog’s developing nervous system. He cultured it in a tiny drop of lymphatic fluid and observed that the axons grew by a process of active outgrowth and elongation.

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