Table 3. DAVID 6.7 Analysis.

Gene list input	Gene counts	Percent of input list	Fold enrichments over background	Bonferroni corrected p-values
(A) Novel L1s—with overlapping genes	Schizophrenia (Normal)
GO_cellular compartment_FAT
GO:0042995~cell projection	18 (NA)	11.76 (NA)	3.03 (NA)	0.0151 (NA)
(B) Novel L1s—no overlapping genes
GO_cellular compartment_FAT
GO:0042995~cell projection	13 (NA)	15.12 (NA)	3.91 (NA)	0.0133 (NA)
(C) KNR L1s—with overlapping genes
GO_cellular compartment_FAT
GO:0044459~plasma membrane part	42 (NA)	21.88 (NA)	1.81 (NA)	0.0242 (NA)
GO:0005886~plasma membrane	61 (NA)	31.77 (NA)	1.53 (NA)	0.0314 (NA)
GO:0043005~neuron projection	17 (18)	8.85 (8.53)	4.71 (4.43)	1.43E−04 (1.53E−04)
GO:0045202~synapse	16 (16)	8.33 (7.58)	4.27 (3.79)	1.16E−03 (5.17E−03)
GO:0030054~cell junction	18 (19)	9.38 (9.00)	3.29 (3.08)	7.28E−03 (0.0103)
GO:0042995~cell projection	21 (22)	10.94 (10.43)	2.85 (2.65)	9.43E−03 (0.0182)
(D) KNR L1s—no overlapping genes
No significant GO terms identified	NA (NA)	NA (NA)	NA (NA)	NA (NA)
(E) Novel+KNR L1s—no overlapping genes
GO_biological process_FAT
GO:0042981~regulation of apoptosis	NA (15)	NA (16.30)	NA (3.55)	NA (0.0470)
GO_cellular compartment_FAT
GO:0045202~synapse	11 (NA)	9.57 (NA)	4.95 (NA)	0.0120 (NA)

Abbreviations: FAT, filtered annotated terms; GO, Gene Ontology; KNR, known non-reference; NA, not applicable.

‘Overlapping genes’ refers to genes harboring L1s found in both the normal and schizophrenia populations.