Distributions of TEs in four model yeasts. Gray lines and filled boxes are schematic representations of major DNA sequence features present on chromosomes without any intention of indicating relative size, position, or presence of specific sequences on the same chromosome. Sequence features include: pA- poly(A) sites; CEN- centromeres; HML/R or mat2/3- hidden/silent mating loci; MAT, mat1, or MTL- mating locus; Pol2 or Pol3- RNA Polymerase II or III-transcribed genes; rDNA- ribosomal DNA; TEL- telomeres; ? - unknown/no bias for sequence features. Vertical arrows indicate sites of TE insertions and the relative proportions of total insertions as shown in the key. Names above arrows indicate specific TEs or groups of TEs: DNA- DNA transposons, DNA/RT- DNA transposons or retrotransposons, LTR- LTR retrotransposons or solo LTRs. Blue horizontal arrows indicate the direction of gene transcription.