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Table 2 Distribution of intron classes in different organisms and organelles

From: Evolution of group II introns

  Eubacteria Archaebacteria Mitochondria Chloroplasts
RNA-based classesa     
 IIA X   X X
 IIB X X X X
IIC X    
IEP-based classesb     
 CL X X X X
 ML X   X X
 A X    
 B X    
 C X    
 D X X   
 E X X   
 F X    
  1. aClasses of introns based on the ribozyme structural characteristics. bClasses of introns based on phylogenetic groupings of the IEPs. CL, chloroplast-like; IEP, intron-encoded protein; ML, mitochondrial-like.