S-Table 8.  The breakdown of the number of genes in each cluster type.				
	Cluster size	Number of 	Expected Number of 	P
Gene Groupa	(number of genes) b	Genes in Clusterc	Genes in Clusterd	Valuee
L1 Muscle	2	290	245.365	0.008338
L1 Muscle	3	66	51.7653	0.112658
L1 Muscle	4	20	10.2492	0.062032
L1 Muscle	5	10	1.9805	0.004996
Sperm	2	142	93.6542	0.00002
Sperm	3	27	15.3594	0.037866
Sperm	4	16	2.3528	1e-5.443011
Sperm	5	0	0.3765	0.39226
Sperm	6	6	0.0504	0
Sperm	7	7	0.0105	0
Germ-Line Enriched	2	112	59.7706	1e-7.619920
Germ-Line Enriched	3	18	7.0788	0.007706
Germ-Line Enriched	4	0	0.748	0.332312
Germ-Line Enriched	5	0	0.0725	0.452062
Germ-Line Enriched	6	6	0.0072	0
Oocyte Enriched	2	26	13.7114	0.00653
Oxidoreductase	2	18	16.0506	0.357562
Oxidoreductase	3	3	0.7761	0.071131
Lipid Metabolism	2	12	11.8184	0.484235
Transcription Factors	2	8	8.485	0.451547
aThe genes in each list are given in supplemental Table 1. 				
bThe cluster size is the number of genes whose predicted start site is within 10kb of another from the same gene group.				
c The number of genes in each cluster type.  The variety of cluster types is different for the different gene groups.				
"dThe number of genes expected of each cluster size given the size of the gene group considered.  Shown are the average number of genes that are of the indicated cluster size from 10,000 repetitions of randomly selecting the same number of genes from the genome as the experimental gene group and counting how many genes are within 10 kb of another gene from the same randomly selected list."				
eThe probability that the observed number of genes of each cluster type could be matched or exceeded by chance.