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AlphaFold predicted structure models of group I (subgroup I-A and subgroup II-B) (A) Structure alignment of APA1 and its Marchantia polymorpha mp4g21390; (B) Structure alignment of subgroup I-A (APA1) and subgroup I-B (AT4G22050); (C) The disulfide bonds of mature APA1 protease domain; (D) The disulfide bonds of saposin-like domain; (E) Disulfide bond topology of subgroup I-A and I-B.
