BCL6 and marginal zone lymphoma: Although the SMZL cases studied in Eμ-HDAC9 mice were BCL6-negative, it is generally accepted that MZL in humans is derived from a post-GC B cell, with associated somatic mutations in the IgVH gene (Dunn-Walters et al., 1998; Miranda et al., 1999; Zhu et al., 1995).