Domain	Number of genes
ubql-1	1
ubr-1	1
UBTFL1	1
UBX	55
ubxn-1	1
ubxn-2	1
ubxn-3	1
ubxn-4	1
ubxn-5	1
ubxn-6	1
UCH	184
UCH_1	7
UCH_C	6
ucp-4	1
ucr-1	1
UCR_14kD	7
ucr-2.1	1
ucr-2.2	1
ucr-2.3	1
UCR_6-4kD	3