What is the burden of persuasion regarding race motivation?

burden shifts to the prosecutor to demonstrate that the challenges were exercised for a race-neutral reason. Third, the court determines whether the defendant has proven purposeful discrimination. The ultimate burden of persuasion regarding racial motivation rests with, and never shifts from, the opponent of the strike. [Citation.] The three-step procedure also applies to state constitutional claims." (People v. Lenix, supra, 44 Cal.4th at pp. 612-613; Gutierrez, supra, 2 Cal.5th at p. 1158.)