Transcription of a productively rearranged Ig VDJC alpha does not require the presence of HS4 in the IgH 3' regulatory region.
Zhang B, Alaie-Petrillo A, Kon M, Li F, Eckhardt LA. Transcription of a productively rearranged Ig VDJC alpha does not require the presence of HS4 in the IgH 3' regulatory region. J Immunol. 2007 May 15; 178(10):6297-306.