Single-site amino acid residue mutation reshapes the characteristics of double bond positions for protostadienol-type triterpenols - Pengyang Lin; Yunpeng Wang; Bing Li; Xuebingting Zhang; Baolian Fan; Ruoshi Huang; Zhongju Ji; Fan Zhang; Jingcai Liang; Lixin Duan (Phytochemistry, 2026)