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Which of the following acts as an attractant for axons?

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Which of the following acts as an attractant for axons?

(a) netrin

(b) porphyrin

(c) integrin

(d) laminin

The question was asked during an online interview.

I want to ask this question from Non-muscle Motility topic in portion Cytoskeleton and Cell Motility of Cell Biology

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Right answer is (a) netrin

For explanation I would say: Advancing tip (growth cone) of a cultured neuron makes a direct turn towards a diffusible protein called netrin. It acts as an attractant for axons growing in an early embryo.

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