10277
Messenger RNA encoded signals that are involved in programmed - 1 ribosomal frameshifting ( - 1 PRF ) are typically two - stemmed hairpin ( H ) - type pseudoknots ( pks ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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