Answer:
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<span>The answer is cytoplasm. There are domains of
Trk receptors in the cytoplasm of cells. When neurotrophins bind to Trk
receptors particular proteins are recruited in a signaling pathway. The proteins
interact with phosphotyrosine residues and this interaction results in
changes in the expression of genes and neurite outgrowth. This determines the direction of cell growth.</span>
Answer: Wind energy can harm migrating birds.
Explanation: Cost doesn't make it controversial, and the first two make me laugh!