REAGENT or RESOURCE	SOURCE	IDENTIFIER
Biological Samples
Primate brain and blood samples	Wake Forest School of Medicine	NA
Human brain tissue	Dallas Brain Collection and NIH Neurobiobank	NA
Critical Commercial Assays
RNAscope 2.5 HD Detection Reagent - RED	Advanced Cell Diagnostics	Cat#322360
RNAscope 2-plex Detection Reagents	Advanced Cell Diagnostics	Cat#320701
PyroMark Gold Q24 Reagents	QIAGEN	Cat#970802
RNeasy Micro Kit	QIAGEN	Cat#74004
Deposited Data
Raw and Analyzed data	This paper	GEO: GSE93788
Raw data of RNA-seq on mouse ARN, DRN, liver and muscle	Bonthuis et al. (2015)	GEO: GSE70484
Allele count table for P8 and P60 cerebellum comparison	Perez et al. (2015)	GEO: GSE67556
Published random monoallelic autosomal gene lists	Gendrel et al. (2014), Eckersley-Maslin et al. (2014), Zwemer et al. (2012), Reinius et al. (2016), Savova et al. (2016)	Sources listed in Table S3
Mouse reference genome (NCBI37/mm9)	Genome Reference Consortium	https://www.ncbi.nlm.nih.gov/grc/mouse
Experimental Models: Organisms/Strains
Mouse: Bmp7LacZ/+/Bmp4 LacZ/+	Godin et al., 1998; Lawson et al., 1999	N/A
Mouse: B6N(Cg)-Adora2b < tm1.1(KOMP)V1cg >/J	The Jackson Laboratory	#018592
Mouse: C57BL/6J	The Jackson Laboratory	#000664
Mouse: CAST/EiJ	The Jackson Laboratory	#000928
Sequence-Based Reagents
Primers for pyrosequencing	This paper	Table S4
Ecoli-LacZ-C2	Advanced Cell Diagnostics	Cat#313451-C2
Hs-CNTNAP2-intron	Advanced Cell Diagnostics	Cat#435841
Hs-DEAF1-intron	Advanced Cell Diagnostics	Cat#435851
Mm-Adora2b	Advanced Cell Diagnostics	Cat#445281
Mm-Adora2b-Intron	Advanced Cell Diagnostics	Cat#435861
Mm-Ank2-Intron4	Advanced Cell Diagnostics	Cat#423941
Mm-Atp8a1-Intron16	Advanced Cell Diagnostics	Cat#423951
Mm-Bmp4	Advanced Cell Diagnostics	Cat#401301
Mm-Bmp4-Intron3	Advanced Cell Diagnostics	Cat#449861
Mm-Bmp7	Advanced Cell Diagnostics	Cat#407901
Mm-Bmp7-Intron5	Advanced Cell Diagnostics	Cat#444521
Mm-Cacng2-Intron1	Advanced Cell Diagnostics	Cat#478221
Mm-Mtap1b-Intron2	Advanced Cell Diagnostics	Cat#439861
Mm-Nr1d1-Intron1	Advanced Cell Diagnostics	Cat#478231
Mm-Oxtr-Intron2	Advanced Cell Diagnostics	Cat#478241
Mm-Pld3-Intron9	Advanced Cell Diagnostics	Cat#423961
Mm-Syn2-Intron-C2	Advanced Cell Diagnostics	Cat#436631-C2
Software and Algorithms
R	R Core Team (2016)	https://www.r-project.org/
ImageJ	Schneider et al. (2012)	https://imagej.nih.gov/ij/
PyroMark Q24 Software	QIAGEN	v2.0.6.20
PyroMark Assay Design SW	QIAGEN	v2.0
Prism	GraphPad	http://www.graphpad.com
Novoalign	Novocraft	http://www.novocraft.com/
EdgeR	Robinson et al. (2010)	https://bioconductor.org/packages/release/bioc/html/edgeR.html