U1 human:mouse:rat:chicken 5:6
#U2 human 41
U2 rat 6:7:15:34:37:39:41:43:44:54:58:60:69:72:89:91
#U2 rat 6:7:15:34:37:39:41:43:44:52:56:58:67:70:87:89
U3 rat 8:12
U12 human 19:28
U4 human:mouse:rat:chicken 4:72:79
U4atac human 12
U5 human:mouse:rat 43:46:53
U6 mouse:rat 31:40:86
U8 mouse 20