Domain	Number of genes
UPF0444	1
UPF0449	6
UPF0489	6
UPF0542	4
UPF0546	3
UPF0547	3
UPF0552	7
UPF0556	1
UPF0561	4
UPF0564	7
UPF0565	2
UPF0640	3
UPF0669	2
UPF0728	3
UPF0767	2
UPF1_Zn_bind	7
Upf2	5
upp-1	1
upr-1	1
UPRTase	12