4657
Our results indicate that interaction between Jak2 and PRLR requires a proline - rich sequence in the membrane proximal region of the receptor , which is conserved among the different members of the cytokine receptor superfamily .
 Jak2, PRLR, cytokine receptor superfamily
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Jak2, PRLR, cytokine receptor superfamily