6078
Effect of single base substitutions at glycine - 870 codon of gramicidin S synthetase 2 gene on proline activation .
 gramicidin S synthetase 2 gene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 gramicidin S synthetase 2 gene