(A) Western blotting of a co-IP experiment from fractionated brain extract showing: a peak MeCP2 fraction (lane 1, 5% input), control IgG IP (lane 2), anti-MeCP2 IP (lane 3), and anti-MeCP2 IP treated with benzonase (lane 4), demonstrates that Prpf3 interacts with MeCP2 in the brain independent of nucleic acids. (B) Western blotting of a co-IP experiment from HA-MeCP2 transfected HT22 cells showing: whole cell extract (lane 1, 5% input), IgG IP (lane 2), anti-HA IP (lane 3) and anti-HA IP treated with benzonase (lane 4), demonstrates that Prpf3 interacts with MeCP2 cell culture independent of nucleic acids.