a. Full PSD geneset association results. For all nine (3 annotation levels by 3 frequency levels), P-values for enrichment of all genesets described and tested in Kirov et al. (2012). In addition to the PSD genes (top five rows), enrichment statistics for presynaptic genes, and neuronal genes clustered on the basis of subcellular location are given. Although the P-values presented are uncorrected, we performed this analysis correcting for all 9×17=153 tests (by considering the distribution of the minimum empirical P-value across tests and sets, as described in the SI). The values in bold are significant (Pcorrected < 0.05) after correction for multiple testing. Both ARC and NMDAR network are significant after multiple test correction, for the singleton NSstrict category. (Note: for ARC the disruptive singleton category is, as reported in the primary test, highly significant and withstands correction for multiple testing in that context; in this broader, less focused analysis it yields Pcorrected=0.17; the majority of Pcorrected values (not shown in Table) are 1.00.) b. PSD and FMRP-target genesets: descriptive statistics and overlap. Overlap between Darnell et al. & Ascano et al. FMRP targets and PSD genes: for example, 57% (16/28) of ARC genes are in the Darnell FMRP list. In contrast, only 7% (2/28) are in the Ascano list. There is a similar trend across the three other major PSD subsets considered here: NMDAR network, PSD-95 and mGluR5 genes. Conversely, 22% of Darnell targets are in the PSD (human core) compared to only 9% of Ascano targets.