P22 (P22) is required for constitutive, exocytotic membrane traffic
in rat liver. p22 is N- myristoylated as is recoverin. The
N-myristoylate group and the calcium induced change in conformation are
essential to the function of P22 . Lin and Barber  reported
that P22 inhibits the GTPase stimulated, Na+/H+ exchanger.