Domain	Number of genes
XPG_I	23
XPG_I_2	31
XPG_N	25
xpo-1	1
Xpo1	38
xpo-2	1
xpo-3	1
XRCC1_N	11
XRCC4	4
xrn-1	1
XRN1_D1	2
XRN1_D2_D3	2
xrn-2	1
XRN_M	5
XRN_N	11
XTBD	2
xtr-1	1
xtr-2	1
Xylo_C	5
XYPPX	7