Maintenance work on the ZORA database servers is scheduled for Thursday 25th July 2019 from 19:00-20:00. During this period ZORA and JDB will not be available. Thank you for your understanding.
Xiong, L; Polacek, N; Sander, P; Böttger, E C; Mankin, A (2001). pKa of adenine 2451 in the ribosomal peptidyl transferase center remains elusive. RNA, 7(10):1365-1369.