5537
The marked aspect of this analysis revealed a significant higher transcriptional level of the opioid peptide dermorphins in P . nordestina skin secretion than in Phyllomedusa hypochondrialis , which is its closest related species , belonging both to the same phylogenetic group .
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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:
 None