We, and others, have performed preliminary analyses that suggest that certainimmunological parameters are associated with specific behavioral symptoms in autism.Impairments in social behaviors, for example, are associated with decreased levelsof TGFβ1 [50], increased IL-1β and IL-13 [12], increased macrophageinhibitory factor [54], decreased platelet-endothelial adhesion molecule [55], total IgG[27], increasedIgG4 isotype [26], altered T cell responses [8], chemokine levels [56] and activatedmonocyte responses [17]. The gene discussed is IL13; the disease is autism.