This family of proteins regulate apoptosis by binding to Bcl-2 and preventing the formation of the anti-apoptotic BAX-BCL2 heterodimers [1].

1: Identification of a protein, G0S2, that lacks Bcl-2 homology domains and interacts with and antagonizes Bcl-2. Welch C, Santra MK, El-Assaad W, Zhu X, Huber WE, Keys RA, Teodoro JG, Green MR; Cancer Res. 2009;69:6782-6789. PMID:19706769