The size heterogeneity of human lysyl oxidase mRNA is due to alternate polyadenylation site and not alternate exon usage.
Boyd CD, Mariani TJ, Kim Y, Csiszar K. The size heterogeneity of human lysyl oxidase mRNA is due to alternate polyadenylation site and not alternate exon usage. Mol Biol Rep. 1995; 21(2):95-103.