Zhao?et?al. Biotechnology for Biofuels and Bioproducts (2022) 15:62 Biotechnology for Biofuels https://doi.org/10.1186/s13068-022-02162-6 and Bioproducts RESEARCH Open Access Genetic modifications of?critical regulators provide new insights into?regulation modes of?raw-starch-digesting enzyme expression in?Penicillium Shengfang Zhao1?, Boyu Xiang1?, Le Yang1, Jie Chen1, Cui Zhu2, Yu Chen1, Jun Cui1, Shengbiao Hu1 and Yibo Hu1* Abstract Background: Starch is a very abundant and ...