Figure S1. Relative expression levels of known mRNA selected as points of reference.

mRNA expression is assigned as very low (+), low (++), medium (+++), high (++++), and very high (+++++). Polr2a, Ppib, and Ubc are housekeeping brain-specific genes previously studied with RNAscope, and Syp and Glast are known cell type markers. The expression levels are also reported from Brain RNA Seq database (http://web.stanford.edu/group/barres_lab/brain_rnaseq.html). FPKM, fragments per kilobase of transcript per million mapped reads.