Most of our mouse strains are available from the Jackson Laboratories in Maine (including the Berns conditional p53 on pure BL6).
The Prime Editor mouse lines that were recently published have been deposited at Jackson Laboratories:
B6.Cg-Gt(ROSA)26Sortm4(CAG-cas9*/GAG-POL,-mNeonGreen)Tyj (catalog #037953) and
B6.Cg-Gt(ROSA)26Sortm4(CAG-cas9*/GAG-POL,-mNeonGreen)Tyj Trp53tm1Brn (catalog #037954)