Exon expression profiling reveals stimulus-mediated exon use in neural cells

Table 1 Distribution of exon positions in RefSeq transcripts and in the exon datasets

Exon position	Percentage in RefSeq database	Percent in KCl exon	P value	Percentage in TPG exon	P value
Initial	9.96	12.79	3.550 × e^-15*	12.63	5.030 × e^-11*
Internal	79.79	67.24	1	68.98	1
Final	10.25	19.97	0*	18.40	0*

RefSeq exons were classified as initial, internal, or final according their presence in RefSeq transcripts. Constituents of the potassium chloride (KCl) and thapsigargin (TPG) exon datasets were mapped to these definitions. *P values showing statistical significance for enrichment of transcript features through a binomial test.

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