Simultaneously promoting gellan lyase expression and gellan oligosaccharide production by gellan gum co-feeding during Pichia pastoris fermentation - Tong Liang; Yuying Wang; Feiyang Duan; Yaping Pan; Zepeng Chang; Qijun Pan; Yun Jiang; Zhitao Li; Minjie Gao (Systems Microbiology and Biomanufacturing, 2026)