ON immunolocalization of oligonucleotide and astrocyte selective proteins. A: APC-1, B: QKI, C: GFAP, D: Merged confocal image. APC-1 and QKI show considerable overlap of immunoreactivity (compare A and B and merged image, D). Few cells stain either with APC-1 alone (arrow) or QKI. APC-1/QKI positive astrocytes can be distinguished using colocalization with GFAP (compare panels C and merged image, D). Scale bar: 50 microns.