Additional file 13.

Excised introns. (a) The 12th intron of smpd4 (sphingomyelin phosphodiesterase 4) mRNA is an excised intron (blue dashed box) and accumulates in the poly(A)- sample in H9 cells. (b) The second intron of atad3b (ATPase family, AAA domain containing 3B) mRNA accumulates in the poly(A)- samples in both H9 and HeLa cells (blue dashed box).

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Yang et al. Genome Biology 2011 12:R16   doi:10.1186/gb-2011-12-2-r16