From: Asymmetrical distribution of non-conserved regulatory sequences at PHOX2B is reflected at the ENCODE loci and illuminates a possible genome-wide trend
Functional non-conserved sequences
Zebrafish phox2b
Human PHOX2B
≤ 10 kb from gene
3/5 functional
2/3 functional
>10 kb from gene
1/8 functional
1/6 functional