Goat antiserum was prepared against erythrocyte membranes obtained from a man who had X-linked muscular dystrophy. When cross-adsorbed with control membranes and tested on double immunodiffusion plates or by binding to intact erythrocytes suspended in thin-layer agar plates, this antiserum discriminated between membranes from phenotypically normal controls and dystrophic men, and between controls and obligate female dystrophy carriers. It also identified two populations among a small sample of women at risk for being dystrophy carriers.
