8941
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 .
 PDE4A - subfamily - specific linker region
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 PDE4A - subfamily - specific linker region