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Structure of SEX4. (A) SEX4 domain structure. The active site of SEX4 is denoted with a black line and labeled Cx5R. (B) Structure of SEX4 showing the integrated architecture of DSP (pink), CBM (green), and C-terminal (blue) domains. (C) Ribbon diagram of SEX4 (residues 90–379) with the active site labeled and S198 in gold sticks. Elements of secondary structure are numbered consecutively from N to C termini.
