TX Lock Without Corresponding TM Lock

I was pretty sure that every TX lock needs TM lock (at least one). But now on my 9.2.0.8 I can see:

SQL> select * from v$lock where type <> 'MR';

ADDR             KADDR                   SID TY        ID1        ID2      LMODE    REQUEST      CTIME      BLOCK
---------------- ---------------- ---------- -- ---------- ---------- ---------- ---------- ---------- ----------
070000026525D648 070000026525D668          4 RT          1          0          6          0    6551105          0
070000026525D3E8 070000026525D408          5 XR          4          0          1          0    6551108          0
070000026525D6E0 070000026525D700          6 TS          2          1          3          0    6551103          0
0700000267173060 07000002671731D8         36 TX     524304    1532490          6          0       2952          0
0700000266EC07F0 0700000266EC0968         63 TX     655400    1550373          6          0       3750          0
0700000266EC0E78 0700000266EC0FF0         65 TX     720899    1461986          6          0       3711          0
0700000265FB6638 0700000265FB67B0         79 TX     327689    1556563          6          0       3825          0
0700000266EDEA08 0700000266EDEB80         85 TX     786469    1365502          6          0       3461          0
0700000266F52498 0700000266F52610        101 TX     196609    1556026          6          0       3850          0
0700000266EDDD10 0700000266EDDE88        126 TX    1114150    1344174          6          0       1474          0
0700000266F517A0 0700000266F51918        137 TX     589849    1605371          6          0       6345          0
07000002671554B8 0700000267155630        207 TX     262156    1529066          6          0       3826          0
07000002670E13B8 07000002670E1530        238 TX     917504    1391304          6          0         66          0
0700000266D094A8 0700000266D094D0        238 TM     194337          0          2          0         35          0
0700000266D093D8 0700000266D09400        238 TM      43802          0          2          0         35          0
0700000266D09308 0700000266D09330        238 TM       7387          0          2          0         35          0
0700000266D09238 0700000266D09260        238 TM       7374          0          2          0         35          0
0700000266D09168 0700000266D09190        238 TM       7380          0          3          0         35          0
0700000266D09098 0700000266D090C0        238 TM       7228          0          3          0         66          0
0700000266F51E28 0700000266F51FA0        261 TX     393224    1563714          6          0       4586          0

So whats can cause this, I can see that TX locks are mostly from JDBC connection from Application server .