Model for the generation of H2A.Z enrichment patterns. The cartoon depicts nucleosome disruptions that occur upon RNA Polymerase II transit. Pol II disruption causes dimer loss that is less for homotypic H2A.Z than for either heterotypic, or canonical H2A, with homotypic H2A.Z being the most stable nucleosome to disruption. H2A.Z homotypics are formed with multiple rounds of Pol II transit and remain relatively stable to further disruption. Heterotypics form but are relatively unstable to successive rounds of Pol II transit, leading to their depletion relative to homotypics. H2A.Z recruits remodelers which should exhibit the highest activity on homotypic H2A.Z, in support of transcription.