A unique octameric structure of Axe2, an intracellular acetyl-xylooligosaccharide esterase from Geobacillus stearothermophilus - Lansky,S; Alalouf,O; Solomon,HV; Alhassid,A; Govada,L; Chayen,NE; Belrhali,H; Shoham,Y; Shoham,G (ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY, 2014)