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Study areas showing the locations of the sampled howler groups and the results of molecular analysis: groups with only RibDNA PCR-positive howler monkeys (gray circle); groups with RibDNA and kDNA-PCR-positive howler monkeys (white circle); groups with RibDNA, kDNA, and SatDNA-PCR-positive howler monkeys positive (black circle). A: Isla Brasilera (IB) and Isla del Cerrito (IC); B: San Cayetano (SC) and Estación Biológica de Corrientes (EBCo).
