This statement is true. The Dombrock blood group system (ISBT 014) antigens (Doᵃ, Doᵇ, etc.) are located on the **ART4 glycoprotein**. ART4 stands for ADP-ribosyltransferase 4 (also known as CD297). While named as a transferase, its enzymatic activity in humans is uncertain. The Do(a-b-) null phenotype is rare and appears to be asymptomatic. Antibodies to Dombrock antigens are often weak and variable but can be clinically significant, causing hemolytic transfusion reactions and mild HDFN.

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Zambia

• loveness Phiri – 1084 pts

• Visual Pathway Lesions
• Positive and Negative Symptoms
• Hallucinations and Delusions
• Antipsychotic Medications
• Emergency: Environmental Emergencies