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@sayacully MAOA genotypes and violence: https://t.co/AhSMwUKwkI MAOA genotypes and race (showing blacks are more likely to carry both versions of the low repeat allele): https://t.co/qpDhTYVUiv https://t.co/yXNzg6f2NR https://t.co/NR44ja1rEq https://t.co/