Catalysis of the transfer of a mannose residue to an oligosaccharide, forming an alpha-(1->2) linkage
1. GOC: mcc
2. PMID 105215413. Reactome: R-HSA-446187 "ALG11 transfers the fourth and fifth Man to the N-glycan precursor"
4. Reactome: R-HSA-446215 "ALG9 transfers Man to N-glycan precursor (GlcNAc)2 (Man)6 (PP-Dol)1"
5. Reactome: R-HSA-446216 "ALG9 transfers Man to N-glycan precursor (GlcNAc)2 (Man)8 (PP-Dol)1"
6. Reactome: R-HSA-4551297 "Defective ALG11 does not transfer Man to the N-glycan precursor"
7. Reactome: R-HSA-4720478 "Defective ALG9 does not add the seventh mannose to the N-glycan precursor"
8. Reactome: R-HSA-9035514 "Defective ALG9 does not add the last mannose to the N-glycan precursor"