All image processing was done using the freely available FIJI (IMAGEJ) software and plugins (Schindelin
et al., 2012). Background was subtracted from all confocal stacks prior to further processing. All
images are sums or maximum intensity Z-projections of the relevant confocal slices. Quantification
of cells with positive/negative staining was done by visually comparing colocalization of GFP and
antibody staining in multiple individual Z-slices.