MBD5 gene and protein isoforms. (a) Coding exons of human MBD5 (exons 6–15) are shown in red. Translation of these exons yields protein isoform 1. (b) Protein isoform 1 is composed of a conserved MBD, a proline-rich segment (P-rich), a PWWP domain, and putative nuclear localization signals (NLS). (c) Coding exons of MBD5 (6–9) are shown in red. Translation of these exons yields protein isoform 2. (d) Protein isoform 2 is composed of a conserved MBD domain, a proline-rich segment (P-rich), and putative NLS.