| Smad 1 and Smad 5 related with transcription factors included core binding factor A 1 ( CBFA 1 ) , smad interacting protein 1 ( SIP 1 ) , ornithine decarboxylase antizyme ( OAZ ) , activating protein 1 ( AP 1 ) , xenopus ventralizing homeobox protein 2 ( Xvent 2 ) , sandostatin ( Ski ) , antiproliferative proteins ( Tob ) , and homeodomain containing transcriptian factor 8 ( Hoxc 8 ) , et al . ^^^ |