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human major histocompatibility complex, class II, DR9
Haplotypes groups	DQA01:DRB10901 to DQA01:DRB10906
Structure (See HLA-DR)
Identifiers	alpha *0101
Symbol(s)	HLA-DRA^{[permanent dead link‍]}
EBI-HLA	DRA*0101
Identifiers	beta 1 *0901
Symbol(s)	HLA-DRB1^{[permanent dead link‍]}
EBI-HLA	DRB1*0901 Archived 2011-05-15 at the Wayback Machine
Shared data
Locus	chr.6 6p21.31

HLA-DR09 (DR9) is a HLA-DR serotype that recognizes the DRB1*0901 gene product.

Serology

The serological reaction of DR9 is relatively good. The serology of DRB1*0902 to *0906 serotypes is unknown.

DRB1*0901: Early childhood myasthenia gravis^[2]

DRB1*0901:DQA1*0301:DQB1*0303 haplotype: Early childhood myastenia gravis^[2]

HLA-DR9 is genetically linked to HLA-DR53, and HLA-DQ3 and DQ9 serotypes.

^ derived from IMGT/HLA
^ ^a ^b Shinomiya N, Nomura Y, Segawa M (2004). "A variant of childhood-onset myasthenia gravis: HLA typing and clinical characteristics in Japan". Clin Immunol. 110 (2): 154–8. doi:10.1016/j.clim.2003.10.004. PMID 15003812.