Sequence logos for the p53 tetramer. From top: the p53 tetramer PWM from this study, the experimental one from Ref.  derived from 100 sites, one computed with the DDNA2 server, experimental matrix from Ref.  obtained from affinity measurements, and the corresponding matrix V$P53_01 from TRANSFAC. All sequence logos presented here were made with enoLOGOS .