3582
Positive selection was tested using genome and transcriptome - wide pair - wise comparisons of homologs in three genera of diatoms ( Pseudo - nitzschia , Ditylum , and Thalassiosira ) that represent decreasing phylogenetic distances .
 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