In this combined group of infants not classified as SIDS, 5-HT1A binding within 7 nuclei sampled, including 5-HT source nuclei in the rostral medulla, e.g., GC, IRZ and PGCL, demonstrated dramatically decreasing levels with increasing PCA at death (age effect: p = 0.010, 0.007 and 0.030, respectively) (Fig 2, Table 5). Here, ARFGAP2 is linked to sudden infant death syndrome.