Polynucleotides comprising one or more of 31 novel single nucleotide polymorphisms in the human solute carrier family 6_neurotransmitter transporter, serotonin_, member 4 (SLC6A4) gene are described. Compositions and methods for detecting one or more of these polymorphisms are also disclosed. In addition, various genotypes and haplotypes for SLC6A4 gene that exist in the population are described.
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