The function of TP73 (tumor protein p73, ENSG00000078900) is as follows. Participates in the apoptotic response to DNA damage. Isoforms containing the transactivation domain are pro-apoptotic, isoforms lacking the domain are anti-apoptotic and block the function of p53 and transactivating p73 isoforms. May be a tumor suppressor protein. Is an activator of FOXJ1 expression (By similarity). It is an essential factor for the positive regulation of lung ciliated cell differentiation (PubMed:34077761). {ECO:0000250|UniProtKB:Q9JJP2, ECO:0000269|PubMed:10203277, ECO:0000269|PubMed:11753569, ECO:0000269|PubMed:18174154, ECO:0000269|PubMed:34077761}.