cis form

例句：

1. 1. The DNA sequence of the gene has a cis form and a trans form.
   这个基因的DNA序列有顺式结构和反式结构。
2. 2. The cis form of the protein is more stable than its trans form.
   蛋白质的顺式形式比其反式形式更稳定。
3. 3. In genetics, the cis form refers to the arrangement of base pairs in the DNA molecule.
   在遗传学中，顺式形式指的是DNA分子中碱基对的排列方式。