bcl-2-Ig SM http://identifiers.org/mgd/MGI:3621054 transgene Tg(BCL2/IGH)2Tjd transgene insertion M23, Timothy J McDonnell Tg(BCL2/IGH)M23Tjd MGI:3621054 Transgene bcl-2-Ig SM|Tg(BCL2/IGH)2Tjd O