Together with the repeats is heptad repeats,resemblingleucine zippers. Three functional nuclear localization signals (NLSs) and an acidicactivation domain (AAD) are also found in the C-terminal region.

• C-端有 3 个核定位信号(Nuclear localization signals, NLSs)和 1 个酸性转录激活域(Acidic transcriptional activation domain, AAD)。