#$%^&*AU2013201088B220160526.pdf#####ABSTRACT A method of diagnosing a pI 1/5-HT receptor related disorders in a subject comprising determining the level of p1 1 in a biological sample from said subject and comparing said pl1 level to a reference, wherein an abnormal level of p1 1 compared to the reference constitutes a positive diagnosis of p 1/5-HT receptor related disorder.