HLA-DR1 Antigen

**Definition:** An HLA-DR antigen associated with HLA-DRB1 CHAINS that are encoded by DRB1*01 alleles.

**Tree numbers:** - D09.400.430.890.509.400.440.400.010 - D12.776.395.550.509.400.440.400.010 - D12.776.543.550.440.400.440.400.010 - D23.050.301.500.400.400.440.400.010 - D23.050.301.500.450.400.440.389.500 - D23.050.705.552.410.400.440.389.010 - D23.050.705.552.450.400.440.389.500

**Synonyms:** - HLA-DR1