431
Vectors derived from a recombinant retrovirus or a DNA / protein complex can efficiently transduce the PAH cDNA into PAH - deficient hepatocytes in vitro , but the application of these vector systems is presently limited by their low transduction efficiency in vivo .
 Disease: PAH - deficient
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
Answer:
 Disease: PAH - deficient