The<unk>  phenotype is a recessive mutation of the Kell blood group system. The<unk>  gene encodes the XK protein, which is located on the X chromosome, and has the structural characteristics of a membrane transport protein but an unknown function. Absence of the XK protein is an X-linked disease. Mutational variants result in<unk>  either with or without neuroacanthocytosis: the gene on the X chromosome for<unk>  is physically close to the gene for chronic granulomatous disease. As a result, an individual with one relatively small deletion may have both diseases. The phenotype may be present without the syndrome presenting.
McLeod syndrome
McKittrick-Wheelock syndrome
Flynn–Aird syndrome
CAMFAK syndrome
Fryns-Aftimos syndrome
Danon disease
Rotor syndrome
Dennie–Marfan syndrome