A wide variety of regulators govern the activity of p53 (top), which, in turn,
controls many distinct biological processes (bottom). Each node represents a
gene and each line represents an interaction. Direct p53 inputs are indicated as
blue lines and direct p53 outputs are indicated as red lines. Noticeably, p53
controls effector processes by activating multiple target genes. Downstream
pathways are highly interconnected (gray lines). Interactions are annotated as
positive (arrow), negative (T-bar), or modifying (solid circle).