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The ratio of index finger length to ring finger length (2D:4D) is considered to be a putative biomarker of prenatal androgen exposure (PAE), with previous research suggesting that 2D:4D is associated with human behaviors, especially sex-typical behaviors. bertengkar 2d bergambar This study empirically examines the relationship between 2D:4D and individual competitiveness, a behavioral trait that is found to be . gurita 4d