Distribution and biosynthesis of 20-hydroxyecdysone in plants of Achyranthes japonica Nakai - Boo, K H; Lee, D; Jeon, G L; Ko, S H; Cho, S K; Kim, J H; Park, S P; Hong, Q; Lee, S H; Lee, D S; Riu, K Z (Biosci Biotechnol Biochem, 2010)