Bunjun, S., Stathopoulos, C., Graham, D., Min, B., Kitabatake, M., Wang, A.L., Wang, C.C., Vivares CP, Weiss, L.M., Soll D. (2000)A dual-specificity aminoacyl-tRNA synthetase in the deep-rooted eukaryote Giardia lamblia, Proc Natl Acad Sci U S A. , 97(24), pp. 12997-3002.