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Semiquantitative PCR analyses of human and mouse retinal first-strand cDNA. Forward PCR primers that distinguish between transcripts initiating in exon A and those initiating in exon 1 were used individually and in combination. Human retina has approximately two times more transcripts that initiate in exon 1 than in exon A. Conversely, mouse retina has six times more transcripts initiating in exon A than in exon 1.
