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Evidence that Hy– RBCs express weak Joa antigen

BACKGROUND: RBCs of the Hy– phenotype have, in the past, been typed as Gy(a+w), Hy–, Jo(a–), and RBCs with the Jo(a–) phenotype type Gy(a+), Hy+w, and Jo(a–). Anti‐Hy and anti‐Joa are difficult to identify mainly because appropriate reagent RBCs are poorly characterized. Historically, anti‐Joa has not reacted with RBCs with either phenotype. This report describes a case of an anti‐Joa that shows Hy– RBCs express some Joa antigen, albeit weakly.