Egelkrout EM, Mariconti L, Settlage SB, Cella R, Robertson D, Hanley-Bowdoin L (2002). "Two E2F elements regulate the proliferating cell nuclear antigen promoter differently during leaf development". Plant Cell 14 (12): 3225–36. doi:10.1105/tpc.006403. PMID 12468739.
Hoege C, Pfander B, Moldovan GL, Pyrowolakis G, Jentsch S: RAD6-dependent DNA repair is linked to modification of PCNA by ubiquitin and SUMO. In: Nature. 419. Jahrgang, Nr.6903, September 2002, S.135–41, doi:10.1038/nature00991, PMID 12226657.
Egelkrout EM, Mariconti L, Settlage SB, Cella R, Robertson D, Hanley-Bowdoin L (2002). "Two E2F elements regulate the proliferating cell nuclear antigen promoter differently during leaf development". Plant Cell 14 (12): 3225–36. doi:10.1105/tpc.006403. PMID 12468739.
Hoege C, Pfander B, Moldovan GL, Pyrowolakis G, Jentsch S: RAD6-dependent DNA repair is linked to modification of PCNA by ubiquitin and SUMO. In: Nature. 419. Jahrgang, Nr.6903, September 2002, S.135–41, doi:10.1038/nature00991, PMID 12226657.