Table 1.

Domain size of the pro-B cell genome compares well with the MLS model. Distribution of domain size across the pro-B cell genome as defined by continuous regions of positive PC1 values across the genome. Upper panel shows distribution of domain size in the transcriptionally permissive compartment. Lower panel indicates distribution of domain size in the repressive compartment.

Domain size	Domains	Active region
5 Mb+	37	25.0%
3–5 Mb	51	18.4%
1–3 Mb	138	22.5%
500 kb–1 Mb	177	11.7%
< 500 kb		22.4%

Domain size	Domains	Inert region
5 Mb+	38	17.7%
3–5 Mb	76	19.2%
1–3 Mb	311	36.5%
500 kb–1 Mb	256	12.2%
< 500 kb		14.3%