Conversion of protopanaxadiol (PPD)-mix-type ginsenosides by seven different glycoside hydrolases. 1, Ginsenoside standard; 2, AglL.gin-556; 3, BglL.gin-484; 4, BglL.gin-952; 5, BglL.gin-902; 6, AgalL.gin-556; 7, AgalL.gin-319; 8, ginsenoside standard.