OBJECTIVE : The present study aimed to estimate the association between susceptibility to migraine and the 12-nucleotide insertion/deletion ( indel ) polymorphism in promoter region of alpha ( 2B ) -adrenergic receptor gene ( ADRA2B ) .
O O O O O O O O O O O O O B-DiseaseOrPhenotypicFeature O O B-SequenceVariant I-SequenceVariant I-SequenceVariant I-SequenceVariant I-SequenceVariant O O O O O B-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct I-GeneOrGeneProduct O O B-GeneOrGeneProduct O O