8037
Furthermore , the PH and PTB domains are highly homologous ( at least 40 % identical ) to those found in insulin receptor substrates 1 , 2 , and 3 ( IRS - 1 , IRS - 2 , and IRS - 3 ) .
 PH, insulin receptor substrates 1 , 2 , and 3, IRS - 1, IRS - 2, IRS - 3
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 PH, insulin receptor substrates 1 , 2 , and 3, IRS - 1, IRS - 2, IRS - 3