Transcriptional activation of p53 responsive genes
type: GO_0008150

Transcriptional activation of cell cycle inhibitor p21
type: GO_0008150
BFO_0000050: Transcriptional activation of p53 responsive genes

Transcriptional activation of p21 by p53 after DNA damage
type: GO_0003674
BFO_0000050: Transcriptional activation of cell cycle inhibitor p21