Association between Duffy blood groups and serum level of the pregnancy zone protein

In a previous study of psoriatic patients we found increased serum levels of the pregnancy zone protein (PZ) in individuals of blood groups O and Fy(a-). In this study we found an association between the PZ serum level and the Fy(a-) blood group also in young healthy males. Thus the association between the PZ serum level and Duffy blood groups appears to apply to both normal and pathological conditions.