SLC1A2 and autism: From the total set of genes constituting the NBC, 233 candidates occur in at least 5 sibling conditions, 74 are present in 7 or more siblings, 29 in 8 or more, 13 in 9 autism siblings, 3 in 10 autism sibling disorders (MAGI2, NR3C1, SLC1A2) and one (SLC1A2) present in 12 siblings.