Bcl-w forms complexes with Bax and Bak, and elevated ratios of Bax/Bcl-w and Bak/Bcl-w correspond to spermatogonial and spermatocyte apoptosis in the testis - Yan,W.; Samson,M.; Jegou,B.; Toppari,J. (Mol Endocrinol, 2000)