24439
The weaker interactions via the carbonyl function in prototypical phytochromes may lead to a higher structural flexibility of the chromophore binding pocket that opens the reaction channel for the thermal ( ZZE --> ZZZ ) Pfr - to - Pr back - conversion .
 Chemical: carbonyl
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: carbonyl