sentence1: The fumarate hydratase gene , located on the long arm of chromosome 1 ( 1q42.3-43 ) , has 22 kilobases and spans 10 exons .
sentence2: The fumarate - hydratase - gene which is located on the long arm of chromosome 1 ( 1q42.3-43 ) has 22 kilobases and comprises 10 exons .