663
An RNA - binding protein gene ( rbp1 ) from Drosophila melanogaster , encoding an RNA recognition motif and an Arg - Ser rich ( RS ) domain , has been characterized .
 RNA - binding protein gene, rbp1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 RNA - binding protein gene, rbp1