9097
Based on the comparison of the predicted amino acid sequences of 1 - sst and 1 - fft with those of other plant fructosyl transferase genes , we postulate that both plant fructan genes have evolved from plant invertase genes .
 1 - sst, 1 - fft, fructosyl transferase genes, fructan genes, invertase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 1 - sst, 1 - fft, fructosyl transferase genes, fructan genes, invertase