Length Polymorphism of Thymidylate Synthase Regulatory Region in Chinese Populations and Evolution of the Novel Alleles - Huai-Rong Luo; Xue-Mei Lü; Yong-Gang Yao; Nobuyuki Horie; Keiichi Takeishi; Lynn B. Jorde; Ya-Ping Zhang (Biochemical Genetics, 2002)