GDA and autism spectrum disorder: Additionally, the presence of maternal auto‐Abs against CRMP1, CRMP2, lactate dehydrogenase A and B (LDH‐A, LDH‐B), guanine deaminase (GDA), stress‐induced phosphoprotein 1 (STIP1), and Y‐box binding protein 1 (YBX1), either individually or in combination, has been linked to maternal autoantibody‐related autism spectrum disorder (MAR ASD) [14, 15, 16].