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Representative diagram of possible interplay between P. nigra haplotypes and dosage variation. N1 (P. nigra 1) encodes a non-functional protein, while N2 (P. nigra 2) encodes a functional protein. Copy number changes on N1 have no effect on phenotypes, while copy number changes on N2 result in dramatic differences on phenotypic outcomes. Chromosomes inherited from P. deltoides (not shown) are always present in one copy.
