tokens: The PDE4A-subfamily specific linker region LR1 , which joins UCR1 and UCR2 , is encoded by two exons , whereas LR2 , which joins UCR2 to the catalytic unit , is encoded by a single exon .
folded_tokens: the pde4a-subfamily specific linker region lr1 , which join ucr1 and ucr2 , be encode by two exon , whereas lr2 , which join ucr2 to the catalytic unit , be encode by a single exon .