Embedded transfer RNA Genes
  In euryarchaeal methanogen M.kandleri and in Nanoarchaea N. equitans some of the missing tRNA genes are embedded in others. We argue from bioinformatic evidence that position specific intron splicing is the key behind co-location of these tRNA genes. 
Zhumur Ghosh, Smarajit Das, Jayprokas Chakrabarti, Bibekanand Mallick   and Satyabrata Sahoo