?:definition
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A series of molecular signals initiated by the binding of a nodal protein to an activin receptor on the surface of a target cell, which contributes to the establishment of an organism\'s body plan or part of an organism with respect to the left and right halves. [GOC:BHF, GOC:vk, PMID:12857784, PMID:17287255, PMID:20413706]
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