However, LRP4 antibodies were less specific than the first two and can be found in 8% of AChR antibody-positive MG (AChR MG), 15% of MuSK antibody-positive MG (MuSK MG), 4% of other neurologic immunizations, and may also be found in the amyotrophic lateral sclerosis (4). The gene discussed is LRP4; the disease is myasthenia gravis.