X-linked mental retardation syndrome with seizures, hypogammaglobulinemia, and progressive gait disturbance is regionally mapped between xq21.33 and Xq23. - Chudley AE; Tackels DC; Lubs HA; Arena JF; Stoeber WP; Kovnats S; Stevenson RE; Schwartz CE (American journal of medical genetics, 1999)