A. ÄÍÊ äÍÒÔ
5’
B
n-1
O CH
2
H O 3’ | + HO-P=O | O
5’|
B
n
O CH
2
H OH 3’
OH | g HO-P=O | O | b HO-P=O | O | a HO-P=O | O | B
n+1
O CH
2
5’ H OH 3’
5’
B
n-1
O CH
2
H O 3’ | HO-P=O | O
B
n
O CH
2
+ PP
i