24340
These observations indicate the importance of SAMDC , in turn polyamines in pollen development , and thus tapetum - specific down - regulation of SAMDC genes using RNAi can be used for developing male sterile plants .
 polyamines
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 polyamines