Immunogen sequence: RRRTDEDRTV MDGGLESDGP NMTENGLEDE SRPQRRNRSR RRRNRGNRTD GSISGDRQPV TVADYISRAE SQSRQRPPLE RTKPSEDSLS GQKGDSVSKL P. Fragile X syndrome is caused by the absence of the fragile X mental-retardation protein (FMRP). FMRP is the archetype of