. "Catalysis of the hydrolysis of the terminal (1->2)-linked alpha-D-mannose residues in the oligo-mannose oligosaccharide Man(9)(GlcNAc)(2)." . . "mannosyl-oligosaccharide 1,2-alpha-mannosidase activity" . "1,2-alpha-mannosidase" . "1,2-alpha-mannosyl-oligosaccharide alpha-D-mannohydrolase activity" . "exo-alpha-1,2-mannanase activity" . "glycoprotein processing mannosidase I" . "Man9-mannosidase activity" . "ManI activity" . "mannose-9 processing alpha-mannosidase activity" . "mannosidase 1A activity" . "mannosidase 1B activity" . "mannosidase I" . . .