9673
In vitro precipitation with a glutathione - S - transferase - fusion protein containing the C - terminal transactivation domain of STAT5a showed GH - regulated association of ERK1 / 2 with the fusion protein , while this was not seen when serine 780 in STAT5a was changed to alanine .
 glutathione - S - transferase - fusion protein, STAT5a, GH, ERK1 / 2, STAT5a
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 glutathione - S - transferase - fusion protein, STAT5a, GH, ERK1 / 2, STAT5a