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Cartoon representation of domain 1 of (a) N. crassa Cel3A (NcCel3A), (b) H. jecorina Cel3A (HjCel3A; PDB entry 3zyz; Karkehabadi et al., 2014 ▸) and (c) H. vulgare ExoI (PDB entry 1iex; Hrmova et al., 2001 ▸) shown in ribbon representation. Loops a and b in NcCel3A and HjCel3A highlight the deleted helices which are present and marked A and B in HvExoI. The position of loop I is highlighted by a circle.
