Processive complex:Okazaki fragment complex Processive complex Formation of Okazaki fragments After RFC initiates the assembly of the primer recognition complex, the complex of pol delta and PCNA is responsible for incorporating the additional nucleotides prior to the position of the next downstream initiator RNA primer. On the lagging strand, short discontinuous segments of DNA, called Okazaki fragments, are synthesized on RNA primers. The average length of the Okazaki fragments is 100 nucleotides. Polymerase switching is a key event that allows the processive synthesis of DNA by the pol delta and PCNA complex. EC Number: 2.7.7.7 Pubmed1328683 Pubmed1671046 Pubmed1974050 Pubmed8104944 Pubmed8144677 Pubmed9081985 Reactome Database ID Release 4369116 Reactome, http://www.reactome.org ReactomeREACT_1024