RNA is complimentary to DNA though, so if an RNA strand has a nucleotide sequence 3' - A A G U C C A G U - 5', then the complimentary DNA or cDNA would be 5' - T T C A G G T C A - 3'.

但RNA与DNA之间互补，所以如果一条RNA链拥有如下核苷酸序列：3' - A A G U C C A G U - 5'，那么与之互补的DNA便是5' - T T C A G G T C A - 3'。