Sequences analyses show that these genes contain the C-X5-C-X4-C-X3-H motif and CHCH ( C-X5-H-X4-C-X3-H ) motif .
序列分析表明它们都含有C-X5-C-X4-C-X3-H基序和保守的CHCH（C-X5-H-X4-C-X3-H）基序。
chch