p Phenotype (Tj(a-) Blood Group): Rare Genetics and Clinical Implications
1. Introduction The p phenotype, historically designated as the Tj(a-) blood group, represents an exceedingly rare and clinically critical null phenotype within the realm of immunohematology. Individuals with this phenotype exhibit a complete absence of the P, P1, and Pk antigens on the surface of their erythrocytes and nucleated tissues. This absolute deficiency is not … Read more