https://www.ncbi.nlm.nih.gov/Structure/pdb/2HCZ
2HCZ: Crystal structure of EXPB1 (Zea m 1), a beta-expansin and group-1 pollen allergen from maize
Beta-expansin 1a2-acetamido-2-deoxy-beta-D-glucopyranosealpha-D-fucopyranosealpha-D-mannopyranosealpha-D-xylopyranose