2898
Hypoxanthine - guanine phosphoribosyltransferase deficiency : analysis of HPRT mutations by direct sequencing and allele - specific amplification .
 Hypoxanthine - guanine phosphoribosyltransferase deficiency
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Hypoxanthine - guanine phosphoribosyltransferase deficiency