In this study , we investigated the expression of the Lys198Asn polymorphism in ET-1 in vitro , as well as the association between either of the two polymorphisms and the plasma ET-1 level .
O O O O O O O O O O B-SequenceVariant O O B-GeneOrGeneProduct O O O O O O O O O O O O O O O O O B-GeneOrGeneProduct O O