缺失式插入苷酸引起三联体密码的改变 CATCAT CATCAT CAT CAT CAT CA C ATC ATCATCATC 1+1 CAT CA C AXT CAT CAT CAT +3 CAX TXC ATX CATCAT CAT缺失或插入核苷酸引起三联体密码的改变 CAT CAT CAT CAT CAT CAT CAT CAC ATC ATC ATC ATC CAT CAC AXT CAT CAT CAT CAX TXC ATX CAT CAT CAT -1 -1,+1 +3