27425
Using this method , 0 . 9 - 1 . 7 mg / ml of modified soluble super - folder green fluorescent protein ( sfGFP ) containing either p - azido - l - phenylalanine ( pAzF ) or p - propargyloxy - l - phenylalanine ( pPaF ) accumulated in the CFPS solutions ; these yields correspond to 50 - 88 % suppression efficiency .
 p - azido - l - phenylalanine, pAzF, p - propargyloxy - l - phenylalanine, pPaF
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 p - azido - l - phenylalanine, pAzF, p - propargyloxy - l - phenylalanine, pPaF