25799
To conduct a phylogenetic analysis , in the current study sequences of the small ( 18S ) and large - subunit ( 28S ) ribosomal RNA , and cytochrome c oxidase subunit 1 ( cox 1 ) were generated for 27 taxa representing 10 of 12 genera of Polymorphidae , plus three additional species of acanthocephalans that were used as outgroups .
 None
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