Chemical and genetic assessment of commercial Radix Astragali (Astragalus spp.) by ion trap LC-MS and nuclear ribosomal DNA sequence analyses. - Xiao,W.; Wang,Q.; Unachukwu,U.; Lau,C.B.; Jiang,B.; Hong,F.; Leung,P.C.; Motley,T.; Livingston,P.; Cassileth,B.; Kennelly,E. (J Agric Food Chem)